CVE-2026-16390

Mitigation bypass in the Enterprise Policies component

Critical · published July 21, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
23.2
In the wild
Unconfirmed
What it is

Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00316 · 23.2th percentile
Published
2026-07-21T12:38Z
EPSS history
Timeline
  • 21 JUL 12:38Z
    Mitigation bypass in the Enterprise Policies component
    cvelistv5