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CVE-2025-6425 The WebCompat WebExtension shipped with Firefox exposed a persistent UUID

🗓️ 24 Jun 2025 12:27:59Reported by mozillaType 
cvelist
 cvelist
🔗 www.cve.org👁 6 Views

An attacker could exploit WebCompat extension to get UUID identifying the browser across sessions.

Related
Affected
Refs
[
  {
    "product": "Firefox",
    "vendor": "Mozilla",
    "versions": [
      {
        "status": "unaffected",
        "version": "115.25",
        "lessThanOrEqual": "115.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "128.12",
        "lessThanOrEqual": "128.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "140",
        "lessThanOrEqual": "*",
        "versionType": "rpm"
      }
    ]
  },
  {
    "product": "Thunderbird",
    "vendor": "Mozilla",
    "versions": [
      {
        "status": "unaffected",
        "version": "128.12",
        "lessThanOrEqual": "128.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "140",
        "lessThanOrEqual": "*",
        "versionType": "rpm"
      }
    ]
  }
]

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