CVE-2026-16379

EUVD-2026-46215 · Published Jul 21, 2026

Privilege escalation in the DOM: Content Processes component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Technologies

Mozilla FirefoxMozilla Thunderbird

Weaknesses

CWE-269

CVSS scores

v3.18.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

MITRE ATT&CK

Inferred

Where this vulnerability fits in an attack

ReconImpact

Initial Access Privilege Escalation

T1190Exploit Public-Facing Application T1548Abuse Elevation Control Mechanism

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2039452
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/

Potentially impacted assets

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