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.
References
| Link | Resource |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1717672 | Issue Tracking Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-51/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-52/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-53/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-54/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-55/ | Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html | |
| https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html |
Configurations
Configuration 1 (hide)
|
History
23 Oct 2026, 22:10
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | (es) Un atacante que enumerara recursos desde la extensión WebCompat podría haber obtenido un UUID persistente que identificaba el navegador y persistía entre contenedores y el modo de navegación normal/privado, pero no entre perfiles. Esta vulnerabilidad afecta a Firefox < 140, Firefox ESR anterior a 115.25 y Firefox ESR anterior a 128.12. |
30 Sep 2026, 18:10
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | (es) Un atacante que enumerara recursos desde la extensión WebCompat podría haber obtenido un UUID persistente que identificaba el navegador y persistía entre contenedores y el modo de navegación normal/privado, pero no entre perfiles. Esta vulnerabilidad afecta a Firefox < 140, Firefox ESR < 115.25 y Firefox ESR < 128.12. |
Information
Published : 2025-06-24 13:15
Updated : 2026-10-23 22:10
NVD link : CVE-2025-6425
Mitre link : CVE-2025-6425
CVE.ORG link : CVE-2025-6425
JSON object : View
Products Affected
mozilla
- firefox
CWE
CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
