CVE-2026-6763

Mitigation bypass in the File Handling component

Medium · published April 21, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
24.0
In the wild
Unconfirmed
What it is

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00322 · 24.0th percentile
Published
2026-04-21T12:40Z
EPSS history
Timeline
  • 21 APR 12:40Z
    Mitigation bypass in the File Handling component
    cvelistv5