CVE-2026-16396

Description

Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2047240 ↗
• https://www.mozilla.org/security/advisories/mfsa2026-68/ ↗
• https://www.mozilla.org/security/advisories/mfsa2026-70/ ↗
• https://www.mozilla.org/security/advisories/mfsa2026-71/ ↗
• https://www.mozilla.org/security/advisories/mfsa2026-72/ ↗