CVE-2026-4688

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 149 Firefox ESR versions prior to 140.9 Thunderbird versions prior to 149 Thunderbird versions prior to 140.9

Description A flaw exists in Firefox and Thunderbird due to a use-after-free condition within the Disability Access APIs component, potentially allowing for a sandbox escape. This issue could allow an attacker to bypass security restrictions and gain unauthorized access.

Recommendations Update Firefox to version 149 or later. Update Firefox ESR to version 140.9 or later. Update Thunderbird to version 149 or later. Update Thunderbird to version 140.9 or later.