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.
49 results
Oct 20, 2026SvelteKit (@sveltejs/kit) from 2.10.0 before 3.0.0 contains a path traversal vulnerability in the vite preview server on Windows that allows unauthenticated attCVE-2026-114063 · Other software · sveltejs · reported by VulnCheckHigh 8.7
SvelteKit (@sveltejs/kit) from 2.10.0 before 3.0.0 contains a path traversal vulnerability in the vite preview server on Windows that allows unauthenticated attackers to read files outside the prerendered output directory. Attackers who can reach the preview server through network access or a tunnel can send crafted requests to expose source code, configuration, or credentials readable by the server process.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Oct 20, 2026SvelteKit before 3.0.0 contains a server-side request forgery vulnerability that allows remote attackers to reach internal services because self-fetch fallbacksCVE-2026-114062 · Other software · sveltejs · reported by VulnCheckMedium 6.9
SvelteKit before 3.0.0 contains a server-side request forgery vulnerability that allows remote attackers to reach internal services because self-fetch fallbacks follow HTTP redirects automatically. Attackers can manipulate the Host or forwarded headers to point fallback requests at their server, which redirects them to internal services.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Oct 20, 2026SvelteKit (@sveltejs/kit) before 3.0.0 contains a cross-site scripting vulnerability in prerendered pages because a cache-control header value set via setHeaderCVE-2026-114061 · Other software · sveltejs · reported by VulnCheckLow 2.3
SvelteKit (@sveltejs/kit) before 3.0.0 contains a cross-site scripting vulnerability in prerendered pages because a cache-control header value set via setHeaders is inserted without escaping into a <meta http-equiv="cache-control"> tag. An attacker who can influence that untrusted value at prerender time can break out of the content attribute and inject HTML or JavaScript that executes when users visit the page.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Oct 20, 2026SvelteKit (@sveltejs/kit) before 3.0.0 contains an open redirect vulnerability in enhanced form actions (use:enhance) on routes accepting paths beginning with aCVE-2026-114060 · Other software · sveltejs · reported by VulnCheckLow 2.1
SvelteKit (@sveltejs/kit) before 3.0.0 contains an open redirect vulnerability in enhanced form actions (use:enhance) on routes accepting paths beginning with a double slash. Attackers can craft action paths starting with // that become protocol-relative URLs, causing non-redirect form results to navigate victims to attacker-controlled sites.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Oct 12, 2026Open WebUI from 0.11.1 before 0.11.4 contains a stored cross-site scripting vulnerability in DocxPreview.svelte that allows authenticated users to execute scripCVE-2026-109290 · Other software · open-webui · reported by VulnCheckHigh 8.4
Open WebUI from 0.11.1 before 0.11.4 contains a stored cross-site scripting vulnerability in DocxPreview.svelte that allows authenticated users to execute script by uploading crafted DOCX attachments. Attackers can embed an OOXML altChunk HTML part or script-scheme hyperlink to steal a previewing administrator's session token from local storage and take over the instance.
- Product
- open-webui
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Oct 12, 2026Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders markdown link URLs into anchor hrefsCVE-2026-109288 · Other software · open-webui · reported by VulnCheckHigh 7.2
Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders markdown link URLs into anchor hrefs without validating their scheme. Authenticated users can embed javascript: links in shared chats that, when clicked by a victim, steal the victim's JWT from local storage, including admins' tokens.
- Product
- open-webui
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Sep 18, 2026Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job.CVE-2026-92708 · Other software · sveltejs · reported by GitHubHigh 7.5
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. In versions 5.1.0 through 5.9.2, stringify and uneval functions serialize a typed array by emitting its entire backing ArrayBuffer rather than only the view, so serializing a Node Buffer, whose backing store is a process-wide shared pool, discloses up to 64 KB of unrelated process memory, including bytes from other in-flight requests. In a server-side-rendered framework such as SvelteKit or Nuxt, a public page whose load() returns a small Buffer, or that reads a small file, can therefore ship another user's request body or Authorization header in its HTML without authentication. Because this occurs during serialization, it fires on every such render and is not mitigated by the parse/unflatten prototype-pollution and denial-of-service guards, which only apply when parsing untrusted input. As a workaround, convert Node Buffer objects to Uint8Array before serialization. This issue has been fixed in version 5.9.3.
- Product
- devalue
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Sep 16, 2026Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job.CVE-2026-81176 · Other software · sveltejs · reported by GitHubMedium 5.3
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. Prior to 5.9.2, devalue.parse does not reject out-of-bounds indices that are greater than or equal to values.length in src/parse.js. A specially crafted untrusted payload can make the parser alternate between array representations, producing quadratic work as the payload grows and causing denial of service in applications that parse untrusted devalue data. This issue is fixed in version 5.9.2.
- Product
- devalue
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Sep 4, 2026Grav Admin before 2.0.20 fails to sanitize output from marked.parse() before injecting it into the DOM via Svelte's {@html} directive in MarkdownEditor and MarkCVE-2026-85601 · Other software · getgrav · reported by VulnCheckMedium 5.1
Grav Admin before 2.0.20 fails to sanitize output from marked.parse() before injecting it into the DOM via Svelte's {@html} directive in MarkdownEditor and MarkdownModal components. Attackers can inject javascript: URI schemes in plugin or theme changelogs to execute arbitrary code in authenticated admin sessions without requiring site access.
- Product
- grav
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Aug 28, 2026SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deseCVE-2026-82261 · Other software · sveltejs · reported by VulnCheckHigh 8.7
SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Aug 28, 2026SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions (experimental.remoteFunctions) and form enabled contain a memory exhCVE-2026-82260 · Other software · sveltejs · reported by VulnCheckHigh 8.7
SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions (experimental.remoteFunctions) and form enabled contain a memory exhaustion vulnerability in remote form deserialization. Malformed form data can cause excessive memory allocation, crashing the server process and resulting in denial of service. Fixed in 2.52.2.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Aug 28, 2026SvelteKit versions from 2.49.0 through 2.53.2 (fixed in 2.53.3) contain a deserialization expansion issue in the experimental form remote function.CVE-2026-82259 · Other software · sveltejs · reported by VulnCheckHigh 8.7
SvelteKit versions from 2.49.0 through 2.53.2 (fixed in 2.53.3) contain a deserialization expansion issue in the experimental form remote function. When an application enables experimental.remoteFunctions and uses the form function to process the files array without validating files.length or individual file sizes, an attacker can submit relatively small inputs that expand into very large file arrays, leading to expensive processing and denial of service.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Aug 28, 2026SvelteKit versions from 2.38.0 before 2.60.1 contain a race condition in query.batch that allows concurrent requests from different users to merge under a singlCVE-2026-82258 · Other software · sveltejs · reported by VulnCheckMedium 5.9
SvelteKit versions from 2.38.0 before 2.60.1 contain a race condition in query.batch that allows concurrent requests from different users to merge under a single request context. Attackers can exploit specific timing conditions to access sensitive data from other users' concurrent requests.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Aug 28, 2026SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary user-controllCVE-2026-82257 · Other software · sveltejs · reported by VulnCheckMedium 5.3
SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary user-controlled path names. Attackers can manipulate the deletion path to remove methods on the prototype, potentially disabling application functionality.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Aug 28, 2026SvelteKit before 2.69.1 fails to properly validate remote form function payload sizes, allowing attackers to crash the Node process by sending large payloads.CVE-2026-82256 · Other software · sveltejs · reported by VulnCheckMedium 6.9
SvelteKit before 2.69.1 fails to properly validate remote form function payload sizes, allowing attackers to crash the Node process by sending large payloads. Repeated exploitation causes denial of service by repeatedly crashing the application process.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Aug 7, 2026SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte.CVE-2026-66062 · Other software · sveltejs · reported by GitHubMedium 5.3
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.70.2, the content negotiation header parser used by SvelteKit's request handling (for headers such as Accept) uses a regular expression vulnerable to quadratic backtracking, so a maliciously crafted header value can cause excessive CPU consumption and degrade or deny service. Version 2.70.2 fixes the issue.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 9, 2026Svelte is a performance oriented web framework.CVE-2026-42599 · Other software · sveltejs · reported by GitHubMedium 5.1
Svelte is a performance oriented web framework. Prior to version 5.55.7, when using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. Note that this vulnerability only triggers if the user's browser has JavaScript enabled but Svelte's hydration mechanism does not reach the vulnerable element before the event fires. This issue has been patched in version 5.55.7.
- Product
- svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 9, 2026Svelte is a performance oriented web framework.CVE-2026-42573 · Other software · sveltejs · reported by GitHubMedium 5.3
Svelte is a performance oriented web framework. Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. This issue has been patched in version 5.55.7.
- Product
- svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 9, 2026Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job.CVE-2026-42570 · Other software · sveltejs · reported by GitHubHigh 7.5
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From version 5.6.3 to before version 5.8.1, devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption. This issue has been patched in version 5.8.1.
- Product
- devalue
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 9, 2026Svelte is a performance oriented web framework.CVE-2026-42567 · Other software · sveltejs · reported by GitHubMedium 5.9
Svelte is a performance oriented web framework. From version 5.51.5 to before version 5.55.7, an internal regex in the Svelte runtime can take exponential time to test in <svelte:element this={tag}></svelte:element>. This issue has been patched in version 5.55.7.
- Product
- svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 10, 2026SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte.CVE-2026-40074 · Other software · sveltejs · reported by GitHubMedium 6.3
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, redirect, when called from inside the handle server hook with a location parameter containing characters that are invalid in a HTTP header, will cause an unhandled TypeError. This could result in DoS on some platforms, especially if the location passed to redirect contains unsanitized user input. This vulnerability is fixed in 2.57.1.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 10, 2026SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte.CVE-2026-40073 · Other software · sveltejs · reported by GitHubHigh 8.2
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, under certain circumstances, requests could bypass the BODY_SIZE_LIMIT on SvelteKit applications running with adapter-node. This bypass does not affect body size limits at other layers of the application stack, so limits enforced in the WAF, gateway, or at the platform level are unaffected. This vulnerability is fixed in 2.57.1.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Mar 11, 2026Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job.CVE-2026-30226 · Other software · sveltejs · reported by GitHubMedium 6.3
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. In devalue v5.6.3 and earlier, devalue.parse and devalue.unflatten were susceptible to prototype pollution via maliciously crafted payloads. Successful exploitation could lead to Denial of Service (DoS) or type confusion. This vulnerability is fixed in 5.6.4.
- Product
- devalue
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Feb 25, 2026Svelte performance oriented web framework.CVE-2026-27902 · Other software · sveltejs · reported by GitHubMedium 5.3
Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue.
- Product
- svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Feb 25, 2026Svelte performance oriented web framework.CVE-2026-27901 · Other software · sveltejs · reported by GitHubMedium 5.3
Svelte performance oriented web framework. Prior to version 5.53.5, the contents of `bind:innerText` and `bind:textContent` on `contenteditable` elements were not properly escaped. This could enable HTML injection and Cross-Site Scripting (XSS) if rendering untrusted data as the binding's initial value on the server. Version 5.53.5 fixes the issue.
- Product
- svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Feb 20, 2026svelte performance oriented web framework.CVE-2026-27125 · Other software · sveltejs · reported by GitHubMedium 5.3
svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements (e.g. <div {...attrs}>) enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a precondition outside of Svelte's control — this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
- Product
- svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Feb 20, 2026svelte performance oriented web framework.CVE-2026-27122 · Other software · sveltejs · reported by GitHubMedium 5.1
svelte performance oriented web framework. Prior to 5.51.5, when using <svelte:element this={tag}> in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
- Product
- svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Feb 20, 2026svelte performance oriented web framework.CVE-2026-27121 · Other software · sveltejs · reported by GitHubMedium 5.1
svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. This vulnerability is fixed in 5.51.5.
- Product
- svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Feb 20, 2026svelte performance oriented web framework.CVE-2026-27119 · Other software · sveltejs · reported by GitHubMedium 5.1
svelte performance oriented web framework. From 5.39.3, <=5.51.4, in certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
- Product
- svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Feb 20, 2026SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte.CVE-2026-27118 · Other software · sveltejs · reported by GitHubMedium 5.3
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Versions of @sveltejs/adapter-vercel prior to 6.3.2 are vulnerable to cache poisoning. An internal query parameter intended for Incremental Static Regeneration (ISR) is accessible on all routes, allowing an attacker to cause sensitive user-specific responses to be cached and served to other users. Successful exploitation requires a victim to visit an attacker-controlled link while authenticated. Existing deployments are protected by Vercel's WAF, but users should upgrade as soon as possible. This vulnerability is fixed in 6.3.2.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jan 15, 2026An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable.CVE-2025-15265 · Other software · Svelte · reported by help@fluidattacks.comMedium 5.3
An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a <script> block without HTML‑safe escaping, allowing </script> to terminate the script and inject arbitrary JavaScript. This enables remote script execution in users' browsers, with potential for session theft and account compromise. This issue affects Svelte: from 5.46.0 before 5.46.3.
- Product
- Svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordfluidattacks.comfluidattacks.com
Jan 15, 2026SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte.CVE-2026-22803 · Other software · sveltejs · reported by GitHubHigh 8.2
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From 2.49.0 to 2.49.4, the experimental form remote function uses a binary data format containing a representation of submitted form data. A specially-crafted payload can cause the server to allocate a large amount of memory, causing DoS via memory exhaustion. This vulnerability is fixed in 2.49.5.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jan 15, 2026Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job.CVE-2026-22775 · Other software · sveltejs · reported by GitHubHigh 7.5
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.1.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the ArrayBuffer hydration expecting base64 encoded strings as input, but not checking the assumption before decoding the input. This vulnerability is fixed in 5.6.2.
- Product
- devalue
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jan 15, 2026Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job.CVE-2026-22774 · Other software · sveltejs · reported by GitHubHigh 7.5
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.3.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the typed array hydration expecting an ArrayBuffer as input, but not checking the assumption before creating the typed array. This vulnerability is fixed in 5.6.2.
- Product
- devalue
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jan 15, 2026SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte.CVE-2025-67647 · Other software · sveltejs · reported by GitHubHigh 8.4
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.49.5, SvelteKit is vulnerable to a server side request forgery (SSRF) and denial of service (DoS) under certain conditions. From 2.44.0 through 2.49.4, the vulnerability results in a DoS when your app has at least one prerendered route (export const prerender = true). From 2.19.0 through 2.49.4, the vulnerability results in a DoS when your app has at least one prerendered route and you are using adapter-node without a configured ORIGIN environment variable, and you are not using a reverse proxy that implements Host header validation. This vulnerability is fixed in 2.49.5.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2025sveltekit-superforms makes SvelteKit forms a pleasure to use.CVE-2025-62381 · Network & remote access · ciscoheat · reported by GitHubHigh 8.3
sveltekit-superforms makes SvelteKit forms a pleasure to use. sveltekit-superforms v2.27.3 and prior are susceptible to a prototype pollution vulnerability within the parseFormData function of formData.js. An attacker can inject string and array properties into Object.prototype, leading to denial of service, type confusion, and potential remote code execution in downstream applications that rely on polluted objects. This vulnerability is fixed in 2.27.4.
- Product
- sveltekit-superforms
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 26, 2025Svelte devalue is a utility library.CVE-2025-57820 · Other software · sveltejs · reported by GitHubHigh 7.9
Svelte devalue is a utility library. Prior to version 5.3.2, a string passed to devalue.parse could represent an object with a __proto__ property and devalue.parse does not check that an index is numeric. This could result in assigning prototypes to objects and properties, leading to prototype pollution. This issue has been fixed in version 5.3.2
- Product
- devalue
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
May 2, 2025Flags SDK is an open-source feature flags toolkit for Next.js and SvelteKit.CVE-2025-46332 · Other software · vercel · reported by GitHubMedium 6.5
Flags SDK is an open-source feature flags toolkit for Next.js and SvelteKit. Impacted versions include flags from 3.2.0 and prior and @vercel/flags from 3.1.1 and prior as certain circumstances allows a bad actor with detailed knowledge of the vulnerability to list all flags returned by the flags discovery endpoint (.well-known/vercel/flags). This vulnerability allows for information disclosure, where a bad actor could gain access to a list of all feature flags exposed through the flags discovery endpoint, including the flag names, flag descriptions, available options and their labels (e.g. true, false), and default flag values. This issue has been patched in flags@4.0.0, users of flags and @vercel/flags should also migrate to flags@4.0.0.
- Product
- flags
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 15, 2025SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte.CVE-2025-32388 · Other software · sveltejs · reported by GitHubMedium 5.4
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.20.6 , unsanitized search param names cause XSS vulnerability. You are affected if you iterate over all entries of event.url.searchParams inside a server load function. Attackers can exploit it by crafting a malicious URL and getting a user to click a link with said URL. This vulnerability is fixed in 2.20.6.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 25, 2024SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte.CVE-2024-53262 · Other software · sveltejs · reported by GitHubLow 2
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. The static error.html template for errors contains placeholders that are replaced without escaping the content first. error.html is the page that is rendered when everything else fails. It can contain the following placeholders: %sveltekit.status% — the HTTP status, and %sveltekit.error.message% — the error message. This leads to possible injection if an app explicitly creates an error with a message that contains user controlled content. Only applications where user provided input is used in the `Error` message will be vulnerable, so the vast majority of applications will not be vulnerable This issue has been addressed in version 2.8.3 and all users are advised to upgrade. There are no known workarounds for this vulnerability.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 25, 2024SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte.CVE-2024-53261 · Other software · sveltejs · reported by GitHubLow 2
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. "Unsanitized input from *the request URL* flows into `end`, where it is used to render an HTML page returned to the user. This may result in a Cross-Site Scripting attack (XSS)." The files `packages/kit/src/exports/vite/dev/index.js` and `packages/kit/src/exports/vite/utils.js` both contain user controllable data which under specific conditions may flow to dev mode pages. There is little to no expected impact. The Vite development is not exposed to the network by default and even if someone were able to trick a developer into executing an XSS against themselves, a development database should not have any sensitive data. None the less this issue has been addressed in version 2.8.3 and all users are advised to upgrade.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 30, 2024svelte performance oriented web framework.CVE-2024-45047 · Other software · sveltejs · reported by GitHubMedium 5.4
svelte performance oriented web framework. A potential mXSS vulnerability exists in Svelte for versions up to but not including 4.2.19. Svelte improperly escapes HTML on server-side rendering. The assumption is that attributes will always stay as such, but in some situation the final DOM tree rendered on browsers is different from what Svelte expects on server-side rendering. This may be leveraged to perform XSS attacks, and a type of the XSS is known as mXSS (mutation XSS). More specifically, this can occur when injecting malicious content into an attribute within a `noscript` tag. This issue has been addressed in release version 4.2.19. Users are advised to upgrade. There are no known workarounds for this vulnerability.
- Product
- svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
May 14, 2024CMSaaSStarter is a SaaS template/boilerplate built with SvelteKit, Tailwind, and Supabase.CVE-2024-34354 · Other software · CriticalMoments · reported by GitHubMedium 6.5
CMSaaSStarter is a SaaS template/boilerplate built with SvelteKit, Tailwind, and Supabase. Any forks of the CMSaaSStarter template before commit 7904d416d2c72ec75f42fbf51e9e64fa74062ee6 are impacted. The issue is the user JWT Token is not verified on server session. You should take the patch 7904d416d2c72ec75f42fbf51e9e64fa74062ee6 into your fork.
- Product
- CMSaasStarter
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jan 24, 2024SvelteKit is a web development kit.CVE-2024-23641 · Other software · sveltejs · reported by GitHubHigh 7.5
SvelteKit is a web development kit. In SvelteKit 2, sending a GET request with a body eg `{}` to a built and previewed/hosted sveltekit app throws `Request with GET/HEAD method cannot have body.` and crashes the preview/hosting. After this happens, one must manually restart the app. `TRACE` requests will also cause the app to crash. Prerendered pages and SvelteKit 1 apps are not affected. `@sveltejs/adapter-node` versions 2.1.2, 3.0.3, and 4.0.1 and `@sveltejs/kit` version 2.4.3 contain a patch for this issue.
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 14, 2023Svelecte is a flexible autocomplete/select component written in Svelte.CVE-2023-38687 · Other software · mskocik · reported by GitHubMedium 5.4
Svelecte is a flexible autocomplete/select component written in Svelte. Svelecte item names are rendered as raw HTML with no escaping. This allows the injection of arbitrary HTML into the Svelecte dropdown. This can be exploited to execute arbitrary JavaScript whenever a Svelecte dropdown is opened. Item names given to Svelecte appear to be directly rendered as HTML by the default item renderer. This means that any HTML tags in the name are rendered as HTML elements not as text. Note that the custom item renderer shown in https://mskocik.github.io/svelecte/#item-rendering is also vulnerable to the same exploit. Any site that uses Svelecte with dynamically created items either from an external source or from user-created content could be vulnerable to an XSS attack (execution of untrusted JavaScript), clickjacking or any other attack that can be performed with arbitrary HTML injection. The actual impact of this vulnerability for a specific application depends on how trustworthy the sources that provide Svelecte items are and the steps that the application has taken to mitigate XSS attacks. XSS attacks using this vulnerability are mostly mitigated by a Content Security Policy that bl
- Product
- svelecte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 6, 2023The SvelteKit framework offers developers an option to create simple REST APIs.CVE-2023-29008 · Other software · sveltejs · reported by GitHubHigh 8.8
The SvelteKit framework offers developers an option to create simple REST APIs. This is done by defining a `+server.js` file, containing endpoint handlers for different HTTP methods. SvelteKit provides out-of-the-box cross-site request forgery (CSRF) protection to its users. The protection is implemented at `kit/src/runtime/server/respond.js`. While the implementation does a sufficient job of mitigating common CSRF attacks, the protection can be bypassed in versions prior to 1.15.2 by simply specifying an upper-cased `Content-Type` header value. The browser will not send uppercase characters, but this check does not block all expected CORS requests. If abused, this issue will allow malicious requests to be submitted from third-party domains, which can allow execution of operations within the context of the victim's session, and in extreme scenarios can lead to unauthorized access to users’ accounts. This may lead to all POST operations requiring authentication being allowed in the following cases: If the target site sets `SameSite=None` on its auth cookie and the user visits a malicious site in a Chromium-based browser; if the target site doesn't set the `SameSite` attribute expl
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 4, 2023SvelteKit is a web development framework.CVE-2023-29003 · Other software · sveltejs · reported by GitHubHigh 8.8
SvelteKit is a web development framework. The SvelteKit framework offers developers an option to create simple REST APIs. This is done by defining a `+server.js` file, containing endpoint handlers for different HTTP methods. SvelteKit provides out-of-the-box cross-site request forgery (CSRF) protection to its users. While the implementation does a sufficient job in mitigating common CSRF attacks, prior to version 1.15.1, the protection can be bypassed by simply specifying a different `Content-Type` header value. If abused, this issue will allow malicious requests to be submitted from third-party domains, which can allow execution of operations within the context of the victim's session, and in extreme scenarios can lead to unauthorized access to users’ accounts. SvelteKit 1.15.1 updates the `is_form_content_type` function call in the CSRF protection logic to include `text/plain`. As additional hardening of the CSRF protection mechanism against potential method overrides, SvelteKit 1.15.1 is now performing validation on `PUT`, `PATCH` and `DELETE` methods as well. This latter hardening is only needed to protect users who have put in some sort of `?_method= override` feature thems
- Product
- kit
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 12, 2022The package svelte before 3.49.0 are vulnerable to Cross-site Scripting (XSS) due to improper input sanitization and to improper escape of attributes when usingCVE-2022-25875 · Other software · Svelte · reported by report@snyk.ioMedium 5.4
The package svelte before 3.49.0 are vulnerable to Cross-site Scripting (XSS) due to improper input sanitization and to improper escape of attributes when using objects during SSR (Server-Side Rendering). Exploiting this vulnerability is possible via objects with a custom toString() function.
- Product
- Svelte
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 5, 2021The unofficial Svelte extension before 104.8.0 for Visual Studio Code allows attackers to execute arbitrary code via a crafted workspace configuration.CVE-2021-29261 · Other software · Svelte · reported by MITREHigh 7.8
The unofficial Svelte extension before 104.8.0 for Visual Studio Code allows attackers to execute arbitrary code via a crafted workspace configuration.
- Product
- Svelte
- 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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