{
  "fix": "Mozilla Firefox (en-US) 151.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox-151.0",
  "summary": "Mozilla Firefox (en-US) 151.0, released May 19, 2026, fixes 31 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Mozilla Firefox (en-US) 151.0",
  "released": "2026-05-19T00:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2026-8948, rated Critical",
  "supported": true,
  "cveCount": 31,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00605,
  "maxCvss": 9.8,
  "appliesTo": [
    {
      "product": "Mozilla Firefox (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-firefox-en-us",
      "fixedVersion": "151.0",
      "latestVersion": "159.0",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Mozilla Firefox (en-US)",
    "latestVersion": "159.0",
    "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-firefox-en-us"
  },
  "cves": [
    {
      "cveId": "CVE-2026-8948",
      "url": "https://patchblox.com/security/cve/CVE-2026-8948",
      "title": "Same-origin policy bypass in the DOM: Networking component",
      "priority": "Urgent",
      "cvss": 9.1,
      "epss": 0.0042,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8956",
      "url": "https://patchblox.com/security/cve/CVE-2026-8956",
      "title": "Integer overflow in the Networking: JAR component",
      "priority": "High",
      "severity": "important",
      "cvss": 9.8,
      "epss": 0.00605,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8949",
      "url": "https://patchblox.com/security/cve/CVE-2026-8949",
      "title": "Integer overflow in the Widget: Win32 component",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00583,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8946",
      "url": "https://patchblox.com/security/cve/CVE-2026-8946",
      "title": "Incorrect boundary conditions in the Audio/Video: Web Codecs component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.0056,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8953",
      "url": "https://patchblox.com/security/cve/CVE-2026-8953",
      "title": "Sandbox escape due to use-after-free in the Disability Access APIs component",
      "priority": "High",
      "severity": "important",
      "cvss": 9.6,
      "epss": 0.00532,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8975",
      "url": "https://patchblox.com/security/cve/CVE-2026-8975",
      "title": "Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00471,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8954",
      "url": "https://patchblox.com/security/cve/CVE-2026-8954",
      "title": "Incorrect boundary conditions, integer overflow in the Audio/Video component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.00425,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8959",
      "url": "https://patchblox.com/security/cve/CVE-2026-8959",
      "title": "Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component",
      "priority": "High",
      "severity": "important",
      "cvss": 9.6,
      "epss": 0.00417,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8947",
      "url": "https://patchblox.com/security/cve/CVE-2026-8947",
      "title": "Use-after-free in the DOM: Bindings (WebIDL) component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.00413,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8968",
      "url": "https://patchblox.com/security/cve/CVE-2026-8968",
      "title": "Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.00413,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8955",
      "url": "https://patchblox.com/security/cve/CVE-2026-8955",
      "title": "Privilege escalation in the DOM: Workers component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00386,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8957",
      "url": "https://patchblox.com/security/cve/CVE-2026-8957",
      "title": "Privilege escalation in the Enterprise Policies component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00386,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8960",
      "url": "https://patchblox.com/security/cve/CVE-2026-8960",
      "title": "Spoofing issue in WebExtensions",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00376,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8952",
      "url": "https://patchblox.com/security/cve/CVE-2026-8952",
      "title": "Privilege escalation in the Application Update component",
      "priority": "High",
      "cvss": 8.8,
      "epss": 0.00373,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8962",
      "url": "https://patchblox.com/security/cve/CVE-2026-8962",
      "title": "Mitigation bypass in the DOM: Security component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.1,
      "epss": 0.00372,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8945",
      "url": "https://patchblox.com/security/cve/CVE-2026-8945",
      "title": "Sandbox escape in Firefox and Firefox Focus for Android",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00369,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8973",
      "url": "https://patchblox.com/security/cve/CVE-2026-8973",
      "title": "Memory safety bugs fixed in Thunderbird 151",
      "priority": "High",
      "cvss": 8.8,
      "epss": 0.00367,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8974",
      "url": "https://patchblox.com/security/cve/CVE-2026-8974",
      "title": "Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00365,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8958",
      "url": "https://patchblox.com/security/cve/CVE-2026-8958",
      "title": "Information disclosure, sandbox escape in the Security: Process Sandboxing component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.6,
      "epss": 0.00344,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8966",
      "url": "https://patchblox.com/security/cve/CVE-2026-8966",
      "title": "Information disclosure in the IP Protection component",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00332,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8967",
      "url": "https://patchblox.com/security/cve/CVE-2026-8967",
      "title": "Information disclosure in the Graphics: WebGPU component",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00332,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8972",
      "url": "https://patchblox.com/security/cve/CVE-2026-8972",
      "title": "Privilege escalation in the WebRTC: Audio/Video component",
      "priority": "High",
      "cvss": 8.8,
      "epss": 0.0033,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8965",
      "url": "https://patchblox.com/security/cve/CVE-2026-8965",
      "title": "Information disclosure in the DOM: Security component",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00324,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8961",
      "url": "https://patchblox.com/security/cve/CVE-2026-8961",
      "title": "Spoofing issue in the Form Autofill component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.00322,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8970",
      "url": "https://patchblox.com/security/cve/CVE-2026-8970",
      "title": "Privilege escalation in the Security component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00307,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8963",
      "url": "https://patchblox.com/security/cve/CVE-2026-8963",
      "title": "Spoofing issue in the Web Speech component",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00303,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8964",
      "url": "https://patchblox.com/security/cve/CVE-2026-8964",
      "title": "Spoofing issue in the Popup Blocker component",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00302,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8969",
      "url": "https://patchblox.com/security/cve/CVE-2026-8969",
      "title": "Mitigation bypass in the DOM: Security component",
      "priority": "High",
      "cvss": 8.1,
      "epss": 0.0029,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8950",
      "url": "https://patchblox.com/security/cve/CVE-2026-8950",
      "title": "Same-origin policy bypass in the Networking: HTTP component",
      "priority": "High",
      "severity": "important",
      "cvss": 9.3,
      "epss": 0.00194,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8951",
      "url": "https://patchblox.com/security/cve/CVE-2026-8951",
      "title": "Spoofing issue in the Toolbar component in Firefox for Android",
      "priority": "Routine",
      "cvss": 6.5,
      "epss": 0.00252,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8971",
      "url": "https://patchblox.com/security/cve/CVE-2026-8971",
      "title": "Same-origin policy bypass in the Networking: JAR component",
      "priority": "Routine",
      "cvss": 6.5,
      "epss": 0.00206,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}