CVE-2025-6425

Name of the Vulnerable Software and Affected Versions: Firefox versions prior to 140 Firefox ESR versions prior to 115.25 Firefox ESR versions prior to 128.12

Description: An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser. This UUID persisted between containers and normal/private browsing mode, but not profiles.

Recommendations: For Firefox versions prior to 140, update to version 140 or later. For Firefox ESR versions prior to 115.25, update to version 115.25 or later. For Firefox ESR versions prior to 128.12, update to version 128.12 or later.