CVE-2026-16371

HIGH

Privilege escalation in the DOM: Navigation component

Title source: cna

Description

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

References (5)

Core 5

Core References

https://bugzilla.mozilla.org/show_bug.cgi?id=2008369

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/

Scores

CVSS v3 8.8

EPSS 0.0028

EPSS Percentile 20.0%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-269

Status published

Products (7)

mozilla/firefox < 140.13.0

mozilla/firefox < 153.0.0

Mozilla/Firefox 140.13 - 140.*

Mozilla/Firefox 153

mozilla/thunderbird < 140.13.0

Mozilla/Thunderbird 140.13 - 140.*

Mozilla/Thunderbird 153

Published Jul 21, 2026

Tracked Since Jul 21, 2026