CVE-2026-16367: Mozilla Firefox

Critical severity, CVSS 10.0. EPSS: 0.4% chance of exploitation in the next 30 days.

Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Affected products

• Mozilla Firefox: before 153.0.0 (fixed in 153.0.0)
• Mozilla Thunderbird: before 153.0 (fixed in 153.0)

Published 2026-07-21. Last modified 2026-07-24.