CVE-2026-8391

Other issue in the JavaScript Engine component

Medium · published May 12, 2026

CVSS v3.1
5.3
EPSS
1%
Percentile
45.6
In the wild
Unconfirmed
What it is

Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00556 · 45.6th percentile
Published
2026-05-12T12:36Z
EPSS history
Timeline
  • 12 MAY 12:36Z
    Other issue in the JavaScript Engine component
    cvelistv5