CVE-2025-4083

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 138 Firefox ESR versions prior to 128.10 Firefox ESR versions prior to 115.23 Thunderbird versions prior to 138 Thunderbird ESR versions prior to 128.10

Description A process isolation issue stems from improper handling of javascript: URIs, potentially allowing content to execute in the top-level document's process instead of the intended frame. This could enable a sandbox escape.

Recommendations For Firefox versions prior to 138, update to version 138 or later. For Firefox ESR versions prior to 128.10, update to version 128.10 or later. For Firefox ESR versions prior to 115.23, update to version 115.23 or later. For Thunderbird versions prior to 138, update to version 138 or later. For Thunderbird ESR versions prior to 128.10, update to version 128.10 or later.