CVE-2026-16366

Privilege escalation in the DOM: Navigation component

High · published July 21, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
18.0
In the wild
Unconfirmed
What it is

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

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
0.00269 · 18.0th percentile
Published
2026-07-21T12:37Z
EPSS history
Timeline
  • 21 JUL 12:37Z
    Privilege escalation in the DOM: Navigation component
    cvelistv5