{
  "fix": "Mozilla Firefox 154.0",
  "url": "https://patchblox.com/security/fix/macos/org.mozilla.firefox-154.0",
  "summary": "Mozilla Firefox 154.0, released August 12, 2026, fixes 16 CVEs in Mozilla Firefox. None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox is 159.0.1, which also fixes every one of these CVEs.",
  "platform": "macos",
  "type": "app-version",
  "title": "Mozilla Firefox 154.0",
  "released": "2026-08-12T15:25:53Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2026-74989, rated Critical",
  "supported": true,
  "cveCount": 16,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.0057,
  "maxCvss": 10,
  "appliesTo": [
    {
      "product": "Mozilla Firefox",
      "productUrl": "https://patchblox.com/security/product/macos/mozilla-firefox",
      "fixedVersion": "154.0",
      "latestVersion": "159.0.1",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Mozilla Firefox",
    "latestVersion": "159.0.1",
    "productUrl": "https://patchblox.com/security/product/macos/mozilla-firefox"
  },
  "cves": [
    {
      "cveId": "CVE-2026-74989",
      "url": "https://patchblox.com/security/cve/CVE-2026-74989",
      "title": "Internally found bugs fixed in Thunderbird 154",
      "priority": "Urgent",
      "cvss": 9.8,
      "epss": 0.0057,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74956",
      "url": "https://patchblox.com/security/cve/CVE-2026-74956",
      "title": "Same-origin policy bypass in the DOM: Service Workers component",
      "priority": "Urgent",
      "cvss": 9.1,
      "epss": 0.00498,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-75874",
      "url": "https://patchblox.com/security/cve/CVE-2026-75874",
      "title": "Sandbox escape in the Remote Settings Client component",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 10,
      "epss": 0.00455,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74940",
      "url": "https://patchblox.com/security/cve/CVE-2026-74940",
      "title": "Use-after-free in the Graphics: Text component",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.8,
      "epss": 0.00412,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74979",
      "url": "https://patchblox.com/security/cve/CVE-2026-74979",
      "title": "Mitigation bypass in the Add-ons Manager component",
      "priority": "Urgent",
      "cvss": 9.8,
      "epss": 0.00306,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74958",
      "url": "https://patchblox.com/security/cve/CVE-2026-74958",
      "title": "Information disclosure in the WebRTC component",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00452,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74947",
      "url": "https://patchblox.com/security/cve/CVE-2026-74947",
      "title": "Privilege escalation due to invalid pointer in the Graphics component",
      "priority": "High",
      "cvss": 8.8,
      "epss": 0.00449,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74938",
      "url": "https://patchblox.com/security/cve/CVE-2026-74938",
      "title": "Mitigation bypass in the JavaScript: GC component",
      "priority": "High",
      "severity": "important",
      "cvss": 9.1,
      "epss": 0.00442,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74954",
      "url": "https://patchblox.com/security/cve/CVE-2026-74954",
      "title": "Information disclosure due to side-channel in the Storage: Cache API component",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00439,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74937",
      "url": "https://patchblox.com/security/cve/CVE-2026-74937",
      "title": "Use-after-free in the JavaScript: GC component",
      "priority": "High",
      "cvss": 8.8,
      "epss": 0.00436,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74950",
      "url": "https://patchblox.com/security/cve/CVE-2026-74950",
      "title": "Privilege escalation in the Downloads API component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00415,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74952",
      "url": "https://patchblox.com/security/cve/CVE-2026-74952",
      "title": "Privilege escalation in the Application Update component",
      "priority": "High",
      "cvss": 8.8,
      "epss": 0.00415,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74955",
      "url": "https://patchblox.com/security/cve/CVE-2026-74955",
      "title": "Privilege escalation in the Request Handling component",
      "priority": "High",
      "cvss": 8.8,
      "epss": 0.00415,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74965",
      "url": "https://patchblox.com/security/cve/CVE-2026-74965",
      "title": "Privilege escalation in the Shell Integration component",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00303,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74963",
      "url": "https://patchblox.com/security/cve/CVE-2026-74963",
      "title": "Same-origin policy bypass in the Networking: Cookies component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00124,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74968",
      "url": "https://patchblox.com/security/cve/CVE-2026-74968",
      "title": "Site isolation issue in the Graphics: WebRender component",
      "priority": "Routine",
      "severity": "important",
      "cvss": 5.4,
      "epss": 0.00158,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}