Critical security advisoryCriticalFlagged by our vulnerability database: PHP2Shell is on CISA’s exploited list. Most WordPress hosting runs PHP. See if your site is affectedFlagged by our vulnerability database: PHP2Shell is being exploited. DetailsExploited: PHP2Shell. Check your site
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Updated 5 h ago

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.

1,762exploited flaws on CISA’s list
34added in the last 30 days
324new WordPress flaws this week
390,007entries in the database

13 results

  • Oct 6, 2025Mozilla Multiple Products Remote Code Execution VulnerabilityCVE-2010-3765 · Computers, phones & browsers · Mozilla · reported by MITREExploitedCritical 9.8

    Mozilla Firefox, SeaMonkey, and Thunderbird contain an unspecified vulnerability when JavaScript is enabled. This allows remote attackers to execute arbitrary code via vectors related to nsCSSFrameConstructor::ContentAppended, the appendChild method, incorrect index tracking, and the creation of multiple frames, which triggers memory corruption.

    Product
    Multiple Products
    On CISA’s list since
    Oct 6, 2025 (federal fix deadline Oct 27, 2025)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA catalogblog.mozilla.comblogs.sun.com

  • Oct 15, 2024Mozilla Firefox Use-After-Free VulnerabilityCVE-2024-9680 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedRansomwareCritical 9.8

    Mozilla Firefox and Firefox ESR contain a use-after-free vulnerability in Animation timelines that allows for code execution in the content process.

    Product
    Firefox
    On CISA’s list since
    Oct 15, 2024 (federal fix deadline Nov 5, 2024)
    What to do
    Attackers are using this now. Install Mozilla’s update today (ransomware groups use this one). If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA catalogbugzilla.mozilla.orgmsrc.microsoft.com

  • Jun 22, 2023Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free VulnerabilityCVE-2016-9079 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedHigh 7.5

    Mozilla Firefox, Firefox ESR, and Thunderbird contain a use-after-free vulnerability in SVG Animation, targeting Firefox and Tor browser users on Windows.

    Product
    Firefox, Firefox ESR, and Thunderbird
    On CISA’s list since
    Jun 22, 2023 (federal fix deadline Jul 13, 2023)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA catalogrhn.redhat.comrhn.redhat.com

  • May 25, 2022Mozilla Firefox Security Feature Bypass VulnerabilityCVE-2015-4495 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedHigh 8.8

    Moxilla Firefox allows remote attackers to bypass the Same Origin Policy to read arbitrary files or gain privileges.

    Product
    Firefox
    On CISA’s list since
    May 25, 2022 (federal fix deadline Jun 15, 2022)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA cataloglists.opensuse.orglists.opensuse.org

  • May 23, 2022Mozilla Firefox and Thunderbird Sandbox Escape VulnerabilityCVE-2019-11708 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedCritical 10

    Mozilla Firefox and Thunderbird contain a sandbox escape vulnerability that could result in remote code execution.

    Product
    Firefox and Thunderbird
    On CISA’s list since
    May 23, 2022 (federal fix deadline Jun 13, 2022)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA catalogpacketstormsecurity.combugzilla.mozilla.org

  • May 23, 2022Mozilla Firefox and Thunderbird Type Confusion VulnerabilityCVE-2019-11707 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedHigh 8.8

    Mozilla Firefox and Thunderbird contain a type confusion vulnerability that can occur when manipulating JavaScript objects due to issues in Array.pop, allowing for an exploitable crash.

    Product
    Firefox and Thunderbird
    On CISA’s list since
    May 23, 2022 (federal fix deadline Jun 13, 2022)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA catalogbugzilla.mozilla.orgsecurity.gentoo.org

  • Mar 28, 2022Mozilla Firefox and Thunderbird Denial-of-Service VulnerabilityCVE-2013-1690 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedHigh 8.8

    Mozilla Firefox and Thunderbird do not properly handle onreadystatechange events in conjunction with page reloading, which allows remote attackers to cause a denial-of-service (DoS) or possibly execute malicious code via a crafted web site.

    Product
    Firefox and Thunderbird
    On CISA’s list since
    Mar 28, 2022 (federal fix deadline Apr 18, 2022)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA cataloglists.opensuse.orglists.opensuse.org

  • Mar 7, 2022Mozilla Firefox Use-After-Free VulnerabilityCVE-2022-26485 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedHigh 8.8

    Mozilla Firefox contains a use-after-free vulnerability in XSLT parameter processing which can be exploited to perform arbitrary code execution.

    Product
    Firefox
    On CISA’s list since
    Mar 7, 2022 (federal fix deadline Mar 21, 2022)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA catalogbugzilla.mozilla.orgmozilla.org

  • Mar 7, 2022Mozilla Firefox Use-After-Free VulnerabilityCVE-2022-26486 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedCritical 9.6

    Mozilla Firefox contains a use-after-free vulnerability in WebGPU IPC Framework which can be exploited to perform arbitrary code execution.

    Product
    Firefox
    On CISA’s list since
    Mar 7, 2022 (federal fix deadline Mar 21, 2022)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA catalogbugzilla.mozilla.orgmozilla.org

  • Mar 3, 2022Mozilla Firefox Information Disclosure VulnerabilityCVE-2013-1675 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedMedium 6.5

    Mozilla Firefox does not properly initialize data structures for the nsDOMSVGZoomEvent::mPreviousScale and nsDOMSVGZoomEvent::mNewScale functions, which allows remote attackers to obtain sensitive information from process memory via a crafted web site.

    Product
    Firefox
    On CISA’s list since
    Mar 3, 2022 (federal fix deadline Mar 24, 2022)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA cataloglists.opensuse.orglists.opensuse.org

  • Nov 3, 2021Mozilla Firefox And Thunderbird Type Confusion VulnerabilityCVE-2019-17026 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedHigh 8.8

    Mozilla Firefox and Thunderbird contain a type confusion vulnerability due to incorrect alias information in the IonMonkey JIT compiler when setting array elements.

    Product
    Firefox and Thunderbird
    On CISA’s list since
    Nov 3, 2021 (federal fix deadline May 3, 2022)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA catalogpacketstormsecurity.combugzilla.mozilla.org

  • Nov 3, 2021Mozilla Firefox And Thunderbird Use-After-Free VulnerabilityCVE-2020-6820 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedHigh 8.1

    Mozilla Firefox and Thunderbird contain a race condition vulnerability when handling a ReadableStream under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts.

    Product
    Firefox and Thunderbird
    On CISA’s list since
    Nov 3, 2021 (federal fix deadline May 3, 2022)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA catalogbugzilla.mozilla.orgusn.ubuntu.com

  • Nov 3, 2021Mozilla Firefox And Thunderbird Use-After-Free VulnerabilityCVE-2020-6819 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgExploitedHigh 8.1

    Mozilla Firefox and Thunderbird contain a race condition vulnerability when running the nsDocShell destructor under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts.

    Product
    Firefox and Thunderbird
    On CISA’s list since
    Nov 3, 2021 (federal fix deadline May 3, 2022)
    What to do
    Attackers are using this now. Install Mozilla’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.

    Full record and what to do →NVD recordCISA catalogbugzilla.mozilla.orgusn.ubuntu.com

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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