CVE-2026-16365

Weakness

Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153, Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15.

Affected products

• mozilla firefox
• mozilla thunderbird

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2049149
• https://www.mozilla.org/security/advisories/mfsa2026-68/
• https://www.mozilla.org/security/advisories/mfsa2026-71/
• https://www.mozilla.org/security/advisories/mfsa2026-84/
• https://www.mozilla.org/security/advisories/mfsa2026-87/