Vulnerability database
Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.
351 results · page 2 of 8
Aug 12, 2026Prompty is a markdown file format (.prompty) for LLM prompts.CVE-2026-73299 · Computers, phones & browsers · microsoft · reported by GitHubCritical 10
Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 0.1.5 and 2.0.0-beta.5, the TypeScript Nunjucks renderer evaluated untrusted .prompty template bodies with unrestricted JavaScript member access. An attacker-controlled template could traverse constructor and prototype properties to execute JavaScript in the host Node.js process. This issue is fixed in versions 0.1.5 and 2.0.0-beta.5.
- Product
- prompty
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 12, 2026XSS vulnerability in Markdown handling in Apache Allura.CVE-2026-73237 · Websites & servers · Apache Software Foundation · reported by security@apache.orgMedium 6.1
XSS vulnerability in Markdown handling in Apache Allura. This issue affects Apache Allura: from 1.10.0 before 1.19.1. Users are recommended to upgrade to version 1.19.1, which fixes the issue.
- Product
- Apache Allura
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordallura.apache.orglists.apache.org
Aug 10, 2026Firecrawl turns entire websites into LLM-ready markdown or structured data.CVE-2026-72904 · Other software · firecrawl · reported by GitHubCritical 9.3
Firecrawl turns entire websites into LLM-ready markdown or structured data. Prior to 2.11.32, a critical arbitrary file read vulnerability exists in Firecrawl's extraction functionality due to unsafe schema dereferencing of user-supplied JSON schemas in apps/api/src/lib/extract/helpers/dereference-schema.ts. The affected code invokes the json-schema-ref-parser dependency with default resolver settings, allowing external and local file references to be resolved during schema processing. An authenticated attacker can supply a malicious schema containing a $ref within default, const, or enum fields that are not traversed by AJV validation. By triggering a dereference error, file contents from the extract worker filesystem may be included in persisted error messages returned through the extraction API, enabling arbitrary file reads and SSRF against internal or external HTTP endpoints. This issue is fixed in version 2.11.32.
- Product
- firecrawl
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 10, 2026FlyEnv before 4.18.0 fails to sanitize HTML from markdown rendering and AI chat content passed to Vue v-html directives.CVE-2026-69116 · Other software · xpf0000 · reported by VulnCheckMedium 5.3
FlyEnv before 4.18.0 fails to sanitize HTML from markdown rendering and AI chat content passed to Vue v-html directives. Attackers can inject malicious scripts through markdown sources or chat messages that execute in the Electron renderer process with access to Node.js APIs and the filesystem.
- Product
- FlyEnv
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 10, 2026Typemill CMS version 2.x contains a persistent cross-site scripting vulnerability in the Markdown parser extension that allows authenticated users with theme-coCVE-2026-44401 · Other software · Typemill · reported by VulnCheckMedium 4.6
Typemill CMS version 2.x contains a persistent cross-site scripting vulnerability in the Markdown parser extension that allows authenticated users with theme-configuration access to inject malicious JavaScript URIs by supplying unsanitized href values in Markdown links. Attackers can craft Markdown links using the javascript: scheme through ParsedownExtension.php or TwigMarkdownExtension.php, storing a persistent payload that executes in the browser of every visitor who clicks the link, enabling session cookie theft, authenticated request forgery, and credential harvesting.
- Product
- Typemill
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 6, 2026league/commonmark is a PHP library for parsing and rendering CommonMark Markdown.CVE-2026-71488 · Other software · thephpleague · reported by GitHubHigh 7.5
league/commonmark is a PHP library for parsing and rendering CommonMark Markdown. From 0.6.0 until 2.9.0, specially crafted Markdown lines can cause the parser to have quadratic time complexity when converting, because several parsing paths repeatedly rescan growing portions of a line to translate between character positions and byte positions, and the Autolink extension can also copy and validate the remaining line at every URL-like prefix, allowing an attacker who can submit Markdown for conversion to consume disproportionate CPU time with a comparatively small request. This issue is fixed in 2.9.0.
- Product
- commonmark
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 6, 2026league/commonmark is a PHP library for parsing and rendering CommonMark Markdown.CVE-2026-71478 · Other software · thephpleague · reported by GitHubMedium 6.1
league/commonmark is a PHP library for parsing and rendering CommonMark Markdown. From 1.5.0 until 2.9.0, the AttributesExtension's href and src unsafe-link filter can be bypassed by embedding control bytes, such as a tab, carriage return, line feed, or leading C0 control character, in a javascript: URL that browsers discard before parsing the scheme, causing the browser to still execute the script even when the unsafe-link filter is enabled. This issue is fixed in 2.9.0.
- Product
- commonmark
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 6, 2026Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts.CVE-2026-71439 · Other software · mermaid-js · reported by GitHubMedium 5.3
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.6.0 until 11.16.1, Mermaid Radar Diagrams allow arbitrary large values for the ticks parameter, which can cause high CPU usage and freeze the rendering webpage or JavaScript process for long periods of time, potentially until the process is killed from memory exhaustion. This issue is fixed in version 11.16.1.
- Product
- mermaid
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 6, 2026Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts.CVE-2026-71438 · Other software · mermaid-js · reported by GitHubLow 2.4
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.8 and 11.16.1, Mermaid's configuration setters (mermaid.initialize, mermaidAPI.setConfig, and mermaidAPI.updateSiteConfig) merge caller-supplied configuration into Mermaid's internal config using the assignWithDepth deep-merge helper, which is vulnerable to prototype pollution. This is only exploitable if an application forwards untrusted data directly into one of these configuration entry points, which is outside their documented usage; diagram-supplied configuration (e.g. %%{init: {}}%% or YAML frontmatter) is not affected. This issue is fixed in versions 10.9.8 and 11.16.1.
- Product
- mermaid
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 6, 2026Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts.CVE-2026-71437 · Other software · mermaid-js · reported by GitHubMedium 6.5
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.5.0 until 11.16.1, Mermaid Architecture Diagrams are vulnerable to prototype pollution when a diagram defines a group with an id of __proto__. Because the group id is used directly as an object property key without validation, an attacker who can supply diagram text can pollute Object.prototype, potentially affecting the behavior of the embedding application. This issue is fixed in version 11.16.1.
- Product
- mermaid
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 6, 2026Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts.CVE-2026-71436 · Other software · mermaid-js · reported by GitHubMedium 5.3
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 10.6.0 until 10.9.8 and 11.16.1, Mermaid XY Charts are vulnerable to an infinite loop denial of service in the setXAxisRangeData function when configuring an X-Axis with invalid parameters. Because each loop iteration appends an element to an array, this generally causes a RangeError to appear after a few seconds, but it may instead cause the page or JavaScript process to crash from memory exhaustion, depending on the environment. This issue is fixed in versions 10.9.8 and 11.16.1.
- Product
- mermaid
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 6, 2026pymdown-extensions is a collection of extensions for the Python Markdown library.CVE-2026-67422 · Other software · facelessuser · reported by GitHubHigh 7.5
pymdown-extensions is a collection of extensions for the Python Markdown library. In versions up to and including 11.0, four inline processors (caret, tilde, betterem, and magiclink) use regular expressions whose content groups can partition a run of delimiter characters in exponentially many ways, causing catastrophic backtracking. As a result, a single untrusted Markdown line under 50 bytes rendered with markdown.markdown() in each extension's default configuration drives the rendering thread into unbounded CPU usage that grows exponentially with input length, enabling an unauthenticated remote attacker who can submit Markdown to cause denial of service. The exposure is concrete for web applications that render user-supplied Markdown (comments, wikis, issue bodies, live preview), including any app using pymdownx.extra which bundles the vulnerable betterem default, as well as hosted docs/CI systems that build untrusted Markdown. The issue has been fixed in version 11.0.1.
- Product
- pymdown-extensions
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 6, 2026PyMdown Extensions is a set of extensions for the Python-Markdown markdown project.CVE-2026-61632 · Other software · facelessuser · reported by GitHubMedium 5.3
PyMdown Extensions is a set of extensions for the Python-Markdown markdown project. In versions up to and including 10.21.3, the b64 extension is vulnerable to a path traversal that discloses arbitrary files: it inlines images referenced by <img src="..."> by joining the src onto the configured base_path with os.path.normpath and opening the result directly, without verifying that the resolved path stays inside base_path. As a result, an src containing ../ sequences or an absolute path reads a file outside base_path as long as it has an allowed image extension (.png, .jpg, .jpeg, .gif, .svg), and the file's contents are then base64-encoded into the rendered output, disclosing them. An application that renders untrusted Markdown with pymdownx.b64 enabled can therefore leak the contents of image-extension files readable by the process to whoever controls the Markdown or views the output, a targeted file-read bounded by the extension check. This issue has been fixed in version 11.0.
- Product
- pymdown-extensions
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 6, 2026Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts.CVE-2026-50159 · Other software · mermaid-js · reported by GitHubMedium 5.3
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.8 and 11.16.1, Mermaid is vulnerable to CSS injection via sibling combinator selectors generated from diagram-supplied class or id names. An attacker who can supply diagram text can inject arbitrary CSS into the rendered page, potentially altering the appearance or behavior of unrelated page elements. This issue is fixed in versions 10.9.8 and 11.16.1.
- Product
- mermaid
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 30, 2026A carefully crafted editing request could trigger an XSS vulnerability on Apache JSPWiki when parsing errors on the markdown renderer, which could allow the aCVE-2026-48910 · Websites & servers · Apache Software Foundation · reported by security@apache.orgMedium 6.5
A carefully crafted editing request could trigger an XSS vulnerability on Apache JSPWiki when parsing errors on the markdown renderer, which could allow the attacker to execute javascript in the victim's browser and get some sensitive information about the victim. This issue affects Apache JSPWiki: through 2.12.3. Users are recommended to upgrade to version 2.12.4, which fixes the issue.
- Product
- Apache JSPWiki
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordlists.apache.orgopenwall.com
Jul 28, 2026Pivotick’s Markdown node-reference renderer failed to HTML-escape the attacker-controlled nodeName value before interpolating it into both the data-node-name atCVE-2026-66921 · Other software · pivotick · reported by 5a6e4751-2f3f-4070-9419-94fb35b644e8Medium 6.3
Pivotick’s Markdown node-reference renderer failed to HTML-escape the attacker-controlled nodeName value before interpolating it into both the data-node-name attribute and the body of a generated <span> element. Because the node-reference tokenizer rejected only square brackets, a crafted node name could still contain quotation marks, angle brackets, or other HTML metacharacters. An attacker could therefore terminate the quoted attribute or inject additional HTML elements and event-handler attributes. When malicious node-reference content is rendered by a consumer that does not apply DOMPurify or equivalent sanitization, arbitrary JavaScript may execute in the victim’s browser in the security context of the application. Successful exploitation requires a victim to open or render a crafted graph or note and could allow the attacker to access same-origin information, modify displayed content, or perform actions using the victim’s session. The patch resolves the issue by applying context-appropriate HTML escaping to node names before inserting them into either HTML text or quoted attribute values. The shared escaping function now encodes ampersands, angle brackets, and both types o
- Product
- pivotick
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 26, 2026NoteGen before 0.32.0 renders AI chat responses with markdown-it configured with html:true and injects the result into the DOM via dangerouslySetInnerHTML in chCVE-2026-17496 · Other software · codexu · reported by reefs@jfrog.comHigh 8.1
NoteGen before 0.32.0 renders AI chat responses with markdown-it configured with html:true and injects the result into the DOM via dangerouslySetInnerHTML in chat-preview, without HTML sanitization and with CSP set to null. Attacker-controlled content that reaches the model prompt (for example a malicious skill REFERENCE.md that instructs the model to emit HTML) can cause the model response to include executable markup such as an img onerror handler. When the user views the chat response, that markup runs as JavaScript in the privileged Tauri webview, enabling arbitrary script execution in the application context (cross-site scripting).
- Product
- NoteGen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 16, 2026PyMdown Extensions is a set of extensions for the Python-Markdown markdown project.CVE-2026-46338 · Other software · facelessuser · reported by GitHubMedium 4.3
PyMdown Extensions is a set of extensions for the Python-Markdown markdown project. From 10.0.1 until 10.21.3, pymdownx.snippets uses a string-prefix containment check in SnippetPreprocessor.get_snippet_path() in pymdownx/snippets.py when `restrict_base_path: True`, allowing markdown snippet directives to read files from sibling paths that share the same base_path prefix, such as docs and docs_internal. This is a regression of CVE-2023-32309. This issue is fixed in version 10.21.3.
- Product
- pymdown-extensions
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 16, 2026Prompty is a markdown file format (.prompty) for LLM prompts.CVE-2026-53598 · Computers, phones & browsers · microsoft · reported by GitHubHigh 7.5
Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 2.0.0-beta.2, Prompty loaders expanded ${file:...} references in .prompty frontmatter without enforcing that resolved paths stayed within the prompt directory or allowed roots, allowing an attacker-controlled prompt file to read local files through absolute paths, .. traversal, or symlink escapes. This issue is fixed in versions 2.0.0-beta.2.
- Product
- prompty
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 16, 2026Prompty is a markdown file format (.prompty) for LLM prompts.CVE-2026-53597 · Computers, phones & browsers · microsoft · reported by GitHubHigh 8.7
Prompty is a markdown file format (.prompty) for LLM prompts. From 2.0.0-alpha.1 until 2.0.0-beta.3, the @prompty/core TypeScript loader in runtime/typescript/packages/core/src/core/loader.ts used gray-matter without overriding executable js and javascript frontmatter engines, allowing an attacker-controlled .prompty file with ---js frontmatter to execute arbitrary JavaScript during prompt loading. This issue is fixed in version 2.0.0-beta.3.
- Product
- prompty
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 14, 2026linkify-it is a links recognition library with full Unicode support.CVE-2026-48801 · Other software · markdown-it · reported by GitHubHigh 8.7
linkify-it is a links recognition library with full Unicode support. Prior to 5.0.1, LinkifyIt.prototype.match, the package's primary public API, has O(N²) algorithmic complexity for inputs containing many fuzzy links or emails because the JavaScript-level scan loop re-slices input and re-runs unanchored regex searches on progressively shorter tails. Any service that synchronously renders untrusted Markdown with linkify:true on a request hot path can inherit a worker-process denial of service triggerable by a tens-of-KB request body. This issue is fixed in version 5.0.1.
- Product
- linkify-it
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 13, 2026HedgeDoc is an open source, real-time collaborative markdown notes application.CVE-2026-58489 · Other software · hedgedoc · reported by GitHubMedium 6.8
HedgeDoc is an open source, real-time collaborative markdown notes application. Prior to 1.11.0, the GitHub Gist export flow created an OAuth2 state value but only checked that it was present rather than validating it against the value expected for the user's session. Because the state was not properly validated, an attacker could forge a callback URL containing their own valid GitHub OAuth code. When processing the callback, HedgeDoc used the victim's logged-in session to select which note to export, but the attacker's authorization code to determine which GitHub account received it. As a result, a logged-in victim who clicked a crafted link could export their own private, protected, or limited note directly into a Gist controlled by the attacker. This issue has been fixed in version 1.11.0.
- Product
- hedgedoc
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 13, 2026HedgeDoc is an open source, real-time, collaborative, markdown notes application.CVE-2026-58486 · Other software · hedgedoc · reported by GitHubHigh 8.3
HedgeDoc is an open source, real-time, collaborative, markdown notes application. Prior to version 1.11.0, HedgeDoc was vulnerable to a YAML alias bomb due to unsafe processing of the note frontmatter. HedgeDoc parsed frontmatter with js-yaml.load (js-yaml v3) via @hedgedoc/meta-marked, which resolved YAML anchor aliases. A compact malicious payload could therefore expand into a huge object structure, consuming excessive CPU. This expansion ran on every request to the publish view (/s/<shortid>) and, when placed under the opengraph key, the editor view (/<noteId>). A ten-level alias bomb could block the single Node.js event loop for roughly 235 seconds per request, causing concurrent requests to hang or drop and rendering the instance unavailable (DoS). Because the note was stored in the database, the impact survived process restarts until the note was removed. toobusy-js did not reliably mitigate the worst cases, as the event loop was saturated before the middleware could respond. This issue was fixed in version 1.11.0.
- Product
- hedgedoc
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 13, 2026HedgeDoc is an open source, real-time, collaborative, markdown notes application.CVE-2026-58488 · Other software · hedgedoc · reported by GitHubMedium 6.9
HedgeDoc is an open source, real-time, collaborative, markdown notes application. Versions prior to 1.11.0 allowed attackers to circumvent the rate-limiting of the /login and /register routes by spoofing IP addresses. HedgeDoc instances checked for CloudFlare's cf-connecting-ip header and used that instead of the users real IP address, if the header was present even when the request did not originate from Cloudflare. This made it possible for an attacker to spam login requests or create multiple arbitrary accounts by sending another cf-connecting-ip header every few requests. The issue has been fixed in version 1.11.0.
- Product
- hedgedoc
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 13, 2026HedgeDoc is an open source, real-time, collaborative, markdown notes application.CVE-2026-58487 · Other software · hedgedoc · reported by GitHubMedium 5.1
HedgeDoc is an open source, real-time, collaborative, markdown notes application. Prior to version 1.11.0, due to unsafe handling of the local-part of registered email addresses, HedgeDoc was vulnerable to stored HTML Injection through its publish and slide views. An attacker could register a specially crafted email address and inject arbitrary HTML into pages viewed by other users. HedgeDoc accepted RFC 5321 quoted-string local-parts in email addresses during registration. The local-part was then reused as the user's display name without escaping and rendered into HTML in multiple places, including publish and slide views as well as the collaborative editor. An attacker could break out of an HTML attribute and inject arbitrary markup into the page. While the deployed Content-Security-Policy prevented straightforward inline JavaScript execution, the injected HTML was still sufficient to alter page content and embed attacker-controlled resources such as cross-origin iframes. This issue was fixed in version 1.11.0.
- Product
- hedgedoc
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 13, 2026A Server-Side Request Forgery (SSRF) protection bypass existed in the html_to_markdown expansion module of misp-modules.CVE-2026-62143 · Other software · misp · reported by 5a6e4751-2f3f-4070-9419-94fb35b644e8High 8.3
A Server-Side Request Forgery (SSRF) protection bypass existed in the html_to_markdown expansion module of misp-modules. The module attempts to prevent requests to loopback, private, link-local, and other restricted IP address ranges. However, IP addresses were compared against the blocked ranges without first normalising IPv4-mapped IPv6 addresses. An authenticated attacker able to invoke the module could supply an IPv4-mapped IPv6 address, such as: http://[::ffff:127.0.0.1]/ http://[::ffff:169.254.169.254]/ Alternatively, the attacker could use a hostname that resolves to an IPv4-mapped IPv6 address. These addresses were treated as IPv6 addresses and therefore did not match the corresponding blocked IPv4 ranges. Successful exploitation could cause the misp-modules server to connect to services available through its loopback interface, internal network, or link-local network. This could expose internal web services, administrative interfaces, or cloud instance metadata, with retrieved content potentially returned to the attacker as converted Markdown. The vulnerability has been addressed by normalising IPv4-mapped IPv6 addresses to their underlying IPv4 representation before
- Product
- misp-modules
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026Mistune is a Python Markdown parser with renderers and plugins.CVE-2026-59930 · Other software · lepture · reported by GitHubMedium 4.3
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the toc plugin and TableOfContents directive generate heading IDs as predictable toc_N values without slugifying the heading text, allowing attacker-controlled id="toc_N" content to collide with generated anchors and redirect same-page navigation, CSS selectors, or JavaScript handlers. This issue is fixed in version 3.3.0.
- Product
- mistune
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026Mistune is a Python Markdown parser with renderers and plugins.CVE-2026-59929 · Other software · lepture · reported by GitHubMedium 6.1
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the safe_url filter in src/mistune/renderers/html.py blocks only javascript:, vbscript:, file:, and data: schemes, allowing legacy or chained schemes such as feed:, view-source:, jar:, livescript:, mocha:, ms-its:, mk:, and res: to reach rendered href and src attributes and potentially execute script in affected user agents. This issue is fixed in version 3.3.0.
- Product
- mistune
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026Mistune is a Python Markdown parser with renderers and plugins.CVE-2026-59928 · Other software · lepture · reported by GitHubHigh 7.5
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a Markdown document containing many repeated or distinct reference-link definitions causes quadratic work in src/mistune/block_parser.py and the ref_links environment dictionary handling, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.
- Product
- mistune
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026Mistune is a Python Markdown parser with renderers and plugins.CVE-2026-59927 · Other software · lepture · reported by GitHubMedium 5.3
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the Include directive in src/mistune/directives/include.py detects only direct self-includes and not indirect cycles, allowing two markdown files that include each other to trigger unbounded recursion, raise RecursionError, and crash the rendering request. This issue is fixed in version 3.3.0.
- Product
- mistune
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026Mistune is a Python Markdown parser with renderers and plugins.CVE-2026-59926 · Other software · lepture · reported by GitHubMedium 5.3
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_admonition() in src/mistune/directives/admonition.py concatenates the Admonition directive :class: option into the HTML class attribute without escaping, allowing attribute injection and cross-site scripting even when HTMLRenderer escape mode is enabled. This issue is fixed in version 3.2.1.
- Product
- mistune
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026Mistune is a Python Markdown parser with renderers and plugins.CVE-2026-59925 · Other software · lepture · reported by GitHubHigh 7.5
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, long sequences of well-formed double-asterisk or triple-asterisk emphasis pairs around a character cause quadratic work in src/mistune/inline_parser.py because the parser scans forward for matching close markers from every potential opening run, allowing denial of service in default Mistune parsing. This issue is fixed in version 3.3.0.
- Product
- mistune
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026Mistune is a Python Markdown parser with renderers and plugins.CVE-2026-59924 · Other software · lepture · reported by GitHubMedium 5.9
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and normalizes user-supplied include paths without verifying that the result remains within the intended markdown directory, allowing crafted include paths to access files outside that directory when markdown files are processed using md.read(). This issue is fixed in version 3.3.0.
- Product
- mistune
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026Mistune is a Python Markdown parser with renderers and plugins.CVE-2026-59923 · Other software · lepture · reported by GitHubMedium 6.1
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, HTMLRenderer.safe_url() does not block percent-encoded javascript URIs, allowing attacker-supplied Markdown links or images to bypass URL protections and execute script in rendered HTML. This issue is fixed in version 3.3.0.
- Product
- mistune
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026Mistune is a Python Markdown parser with renderers and plugins.CVE-2026-59922 · Other software · lepture · reported by GitHubHigh 7.5
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.
- Product
- mistune
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026linkify-it is a links recognition library with full Unicode support.CVE-2026-59887 · Other software · markdown-it · reported by GitHubHigh 7.5
linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in lib/re.mjs, causing O(n^2) CPU consumption on crafted user text. This issue is fixed in version 5.0.2.
- Product
- linkify-it
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026Grav before 2.0.0 (affected through 2.0.0-rc.9 and the 2.0 branch) contains a stored CSS injection vulnerability in the Markdown image resize() media action.CVE-2026-58657 · Other software · Grav · reported by VulnCheckMedium 4.8
Grav before 2.0.0 (affected through 2.0.0-rc.9 and the 2.0 branch) contains a stored CSS injection vulnerability in the Markdown image resize() media action. Prior media hardening rejects direct ?style= payloads and unsafe attribute() fallbacks, but the resize() action in Excerpts::processMediaActions() writes caller-controlled values directly into the image's styleAttributes. A lower-privileged content editor who can edit page Markdown can store a crafted image URL with semicolon-delimited CSS declarations in the resize parameters, which are rendered into the final <img style=...> attribute when a higher-privileged reviewer/admin views the page or preview. This does not require JavaScript execution but enables UI redress/overlay and content-manipulation attacks (e.g., a full-viewport fixed overlay). Fixed in 2.0.0.
- Product
- Grav
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 6, 2026The OpenAI Codex desktop app for macOS rendered remote images from Markdown in model responses.CVE-2026-14898 · Other software · OpenAI · reported by 8f4f43ab-ba69-4d92-aa1d-d772184d6fb7Medium 6.5
The OpenAI Codex desktop app for macOS rendered remote images from Markdown in model responses. An attacker who could place an indirect prompt injection in content processed by Codex, such as a connected-tool result or another untrusted source, could induce the model to construct a remote image URL containing sensitive data. The app automatically fetched that URL when rendering the response, sending the embedded data to an attacker-controlled server without a separate user click. Successful exploitation could exfiltrate secrets and other information accessible in the Codex session, including API keys, source code, and data returned by connected tools. No direct integrity or availability impact was demonstrated, and there is no known exploitation in the wild.
- Product
- Codex desktop app for macOS
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 5, 2026A flaw has been found in zcaceres markdownify-mcp up to 1.1.0.CVE-2026-14702 · Other software · zcaceres · reported by VulDBLow 1.1
A flaw has been found in zcaceres markdownify-mcp up to 1.1.0. This impacts the function saveToTempFile of the file src/Markdownify.ts of the component webpage-to-markdown/youtube-to-markdown/bing-search-to-markdown. This manipulation causes insufficiently random values. The attack is restricted to local execution. A high degree of complexity is needed for the attack. The exploitability is said to be difficult. The exploit has been published and may be used. The pull request to fix this issue awaits acceptance.
- Product
- markdownify-mcp
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 5, 2026A weakness has been identified in zcaceres markdownify-mcp up to 1.1.0.CVE-2026-14699 · Other software · zcaceres · reported by VulDBMedium 4.8
A weakness has been identified in zcaceres markdownify-mcp up to 1.1.0. The affected element is the function assertPathAllowed of the file src/Markdownify.ts. Executing a manipulation can lead to symlink following. The attack can only be executed locally. The pull request to fix this issue awaits acceptance.
- Product
- markdownify-mcp
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 29, 2026Uncontrolled Recursion vulnerability in leandrocp mdex allows denial of service via deeply nested Markdown input.CVE-2026-54888 · Other software · leandrocp · reported by 6b3ad84c-e1a6-4bf7-a703-f496b71e49dbMedium 6.9
Uncontrolled Recursion vulnerability in leandrocp mdex allows denial of service via deeply nested Markdown input. mdex converts between an Elixir %MDEx.Document{} struct and Comrak's internal AST using two mutually recursive Rust functions, ex_document_to_comrak_ast and comrak_ast_to_ex_document, in the NIF source file document.rs. Neither function enforces a maximum nesting depth, so the recursion depth is bounded only by the structure of the input. An attacker who can get a Markdown document rendered (for example through MDEx.parse_document!/1 or MDEx.to_html/1) can supply a document with thousands of nested block quotes, which drives unbounded recursion across the NIF boundary and exhausts the native C stack. Because the resulting stack overflow is an uncatchable SIGSEGV raised inside a NIF, it cannot be contained by the Erlang runtime. It terminates the operating system process running the BEAM, killing every Elixir and Erlang process on the node, not just the caller that triggered the render. No authentication or special privileges are required. The vulnerable conversion code was extracted from mdex into the separate mdex_native package starting in mdex 0.12.3. This issue a
- Product
- mdex
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordcna.erlef.orggithub.com
Jun 26, 2026Mattermost versions 10.11.x <= 10.11.18, 11.6.x <= 11.6.3, 11.5.x <= 11.5.6 fail to properly apply markdown image rendering restrictions to AI bot tool result pCVE-2026-3472 · Other software · Mattermost · reported by responsibledisclosure@mattermost.comLow 3.5
Mattermost versions 10.11.x <= 10.11.18, 11.6.x <= 11.6.3, 11.5.x <= 11.5.6 fail to properly apply markdown image rendering restrictions to AI bot tool result posts, which allows an authenticated attacker to exfiltrate data to an attacker-controlled server via injecting markdown image syntax into tool result content rendered by a victim's client.. Mattermost Advisory ID: MMSA-2026-00619
- Product
- Mattermost
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 25, 2026Server-Side Request Forgery in the markdown_to_pdf action of Rapid7 InsightConnect Markdown Plugin on Linux in versions prior to 4.0.2 allows remote attackers tCVE-2026-8661 · Other software · Rapid7 · reported by cve@rapid7.comMedium 4.8
Server-Side Request Forgery in the markdown_to_pdf action of Rapid7 InsightConnect Markdown Plugin on Linux in versions prior to 4.0.2 allows remote attackers to make arbitrary outbound HTTP requests via unsanitized resource-loading HTML elements (img/src, CSS url(), @import) embedded in Markdown input. The initial fix in 4.0.0 disabled JavaScript but did not neutralize resource-loading vectors. Resolved in 4.0.2 by sanitizing HTML with an allowlist of tags, attributes, and URL schemes.
- Product
- InsightConnect Markdown Plugin
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 24, 2026Mistune is a Python Markdown parser with renderers and plugins.CVE-2026-49851 · Other software · lepture · reported by GitHubHigh 8.7
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Mistune is vulnerable to a CPU exhaustion DoS due to superlinear (approximately O(n²)) behavior in parse_link_text. When parsing Markdown containing many consecutive [ characters, parse_link_text repeatedly scans the input using a regex search inside a loop. Each iteration re-scans a large portion of the remaining string, resulting in quadratic-time behavior. An attacker-controlled Markdown input can therefore trigger excessive CPU usage with a very small payload. This vulnerability is fixed in 3.3.0.
- Product
- mistune
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comaccess.redhat.com
Jun 23, 2026OpenHarness /issue and /pr_comments slash commands lack remote_invocable=False protection, allowing remote channel senders to write attacker-controlled MarkdownCVE-2026-56696 · Other software · HKUDS · reported by VulnCheckMedium 5.3
OpenHarness /issue and /pr_comments slash commands lack remote_invocable=False protection, allowing remote channel senders to write attacker-controlled Markdown into project context files. Admitted remote attackers can inject malicious content into .openharness/issue.md and .openharness/pr_comments.md files, which are subsequently injected into runtime system prompts, persistently influencing local agent behavior.
- Product
- OpenHarness
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 18, 2026In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from AI responses, triggering HTTP requests to arbitrary external URLs withoCVE-2026-22551 · Other software · Eclipse Foundation · reported by emo@eclipse.orgMedium 6.7
In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from AI responses, triggering HTTP requests to arbitrary external URLs without restriction. Combined with prompt injection in a malicious workspace, an attacker could induce the AI agent to construct image URLs encoding sensitive information from the workspace or conversation context, exfiltrating it to attacker-controlled servers. The workspace trust enforcement introduced in v1.71.0 mitigates the documented attack chain by disabling AI features in untrusted workspaces.
- Product
- Eclipse Theia
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 17, 2026markdown-it is a Markdown parser.CVE-2026-48988 · Other software · markdown-it · reported by GitHubMedium 5.3
markdown-it is a Markdown parser. Versions 14.1.1 and below contain a denial-of-service vulnerability when typographer: true is enabled, due to quadratic (O(n^2)) processing in the smartquotes rule. The issue stems from repeatedly modifying strings with replaceAt(), which performs O(n) slicing and concatenation per quote character. This can cause excessive CPU consumption when parsing quote-heavy, user-supplied markdown and may let attackers degrade or disrupt service availability. Although typographer is disabled by default, many production apps enable it for smart typography, making the issue relevant. This issue has been fixed in version 14.2.0.
- Product
- markdown-it
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 9, 2026A markdown based cross-site scripting (XSS) vulnerability in the AI assistant chat function of FastapiAdmin v2.2.0 allows attackers to execute arbitrary web scrCVE-2026-36728 · Other software · reported by MITREMedium 5.4
A markdown based cross-site scripting (XSS) vulnerability in the AI assistant chat function of FastapiAdmin v2.2.0 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into a chat message.
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 9, 2026A markdown based cross-site scripting (XSS) vulnerability in the /system/notice/create endpoint of FastapiAdmin v2.2.0 allows attackers to execute arbitrary webCVE-2026-36725 · Other software · reported by MITREMedium 6.1
A markdown based cross-site scripting (XSS) vulnerability in the /system/notice/create endpoint of FastapiAdmin v2.2.0 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the notice_content parameter.
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 9, 2026md-fileserver allows for local viewing of markdown files in a browser.CVE-2026-46492 · Other software · commenthol · reported by GitHubHigh 7.2
md-fileserver allows for local viewing of markdown files in a browser. Prior to version 1.10.3, a cross-site scripting (XSS) vulnerability exists in the application’s Markdown rendering logic. When user-supplied Markdown content is rendered, embedded raw HTML—including <script> tags—is processed and injected into the resulting page without sanitization, allowing arbitrary JavaScript execution in the context of the affected domain. This issue has been patched in version 1.10.3.
- Product
- md-fileserver
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.
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