CVE-2026-16371CWE-269privilege-escalation

CVE-2026-16371

High · published July 21, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
21.2
In the wild
Unconfirmed
What it is

Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, Thunderbird 140.13, Firefox ESR 140.15, and Thunderbird 140.15.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00297 · 21.2th percentile
Weakness
CWE-269 · Improper Privilege Management
Published
2026-07-21T17:17Z
Affected products (4)
ProductVersionsFixed in
mozilla/firefox< 140.13.0140.13.0
mozilla/firefox< 153.0.0153.0.0
mozilla/thunderbird< 140.13.0140.13.0
mozilla/thunderbird≥ 141.0, < 153.0153.0
References (7)
https://bugzilla.mozilla.org/show_bug.cgi?id=2008369 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-68/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-70/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-71/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-72/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-84/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-87/ · [email protected]
EPSS history
Timeline
  • 21 JUL 12:37Z
    Privilege escalation in the DOM: Navigation component
    cvelistv5