{
  "fix": "Firefox Developer Edition (en-US) 138.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition-138.0",
  "summary": "Firefox Developer Edition (en-US) 138.0, released April 18, 2025, fixes 12 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: High. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Firefox Developer Edition (en-US) 138.0",
  "released": "2025-04-18T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2025-2817, high severity",
  "supported": true,
  "cveCount": 12,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00667,
  "maxCvss": 9.1,
  "appliesTo": [
    {
      "product": "Firefox Developer Edition (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/firefox-developer-edition-en-us",
      "fixedVersion": "138.0",
      "latestVersion": "156.0",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Firefox Developer Edition (en-US)",
    "latestVersion": "156.0",
    "productUrl": "https://patchblox.com/security/product/windows-app/firefox-developer-edition-en-us"
  },
  "cves": [
    {
      "cveId": "CVE-2025-2817",
      "url": "https://patchblox.com/security/cve/CVE-2025-2817",
      "title": "Privilege escalation in Thunderbird Updater",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00667,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-4091",
      "url": "https://patchblox.com/security/cve/CVE-2025-4091",
      "title": "Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.8,
      "epss": 0.00507,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-4083",
      "url": "https://patchblox.com/security/cve/CVE-2025-4083",
      "title": "Process isolation bypass using \u0022javascript:\u0022 URI links in cross-origin frames",
      "priority": "High",
      "severity": "Medium",
      "cvss": 9.1,
      "epss": 0.00459,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-4087",
      "url": "https://patchblox.com/security/cve/CVE-2025-4087",
      "title": "Unsafe attribute access during XPath parsing",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.8,
      "epss": 0.00323,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-4085",
      "url": "https://patchblox.com/security/cve/CVE-2025-4085",
      "title": "Potential information leakage and privilege escalation in UITour actor",
      "priority": "High",
      "severity": "Medium",
      "cvss": 7.1,
      "epss": 0.00305,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-4082",
      "url": "https://patchblox.com/security/cve/CVE-2025-4082",
      "title": "WebGL shader attribute memory corruption in Thunderbird for macOS",
      "priority": "Routine",
      "cvss": 5.9,
      "epss": 0.00459,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-4090",
      "url": "https://patchblox.com/security/cve/CVE-2025-4090",
      "title": "Leaked library paths in Thunderbird for Android",
      "priority": "Routine",
      "cvss": 5.3,
      "epss": 0.00332,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-3608",
      "url": "https://patchblox.com/security/cve/CVE-2025-3608",
      "title": "Race condition in nsHttpTransaction could lead to memory corruption",
      "priority": "Routine",
      "cvss": 6.5,
      "epss": 0.0032,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-4092",
      "url": "https://patchblox.com/security/cve/CVE-2025-4092",
      "title": "Memory safety bugs fixed in Firefox 138 and Thunderbird 138",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 6.5,
      "epss": 0.0031,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-4086",
      "url": "https://patchblox.com/security/cve/CVE-2025-4086",
      "title": "Specially crafted filename could be used to obscure download type",
      "priority": "Routine",
      "cvss": 6.5,
      "epss": 0.00295,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-4089",
      "url": "https://patchblox.com/security/cve/CVE-2025-4089",
      "title": "Potential local code execution in \u0022copy as cURL\u0022 command",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 5.1,
      "epss": 0.00186,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-4088",
      "url": "https://patchblox.com/security/cve/CVE-2025-4088",
      "title": "Cross-site request forgery via storage access API redirects",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 6.5,
      "epss": 0.00178,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}