CVE-2025-6425 | An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
- 🔗 bugzilla.mozilla.org/show_bug.cgi
- 🔗 www.mozilla.org/security/advisories/mfsa2025-51/
- 🔗 www.mozilla.org/security/advisories/mfsa2025-52/
- 🔗 www.mozilla.org/security/advisories/mfsa2025-53/
- 🔗 www.mozilla.org/security/advisories/mfsa2025-54/
- 🔗 www.mozilla.org/security/advisories/mfsa2025-55/
- 🔗 lists.debian.org/debian-lts-announce/2025/06/msg00029.html
- 🔗 lists.debian.org/debian-lts-announce/2025/07/msg00002.html
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CVE-2025-6425 | An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was
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