CVE-2026-75874

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Thunderbird versions prior to 154

Description A sandbox escape exists in the Remote Settings Client component. A sandbox is a security mechanism for separating running programs, ensuring that code executing in a restricted environment cannot access the rest of the system.

Recommendations Update Firefox to version 154 or later. Update Thunderbird to version 154 or later.