CVE-2026-8971

Same-origin policy bypass in the Networking: JAR component

Medium · published May 19, 2026

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

Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

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
0.00174 · 6.5th percentile
Published
2026-05-19T12:30Z
EPSS history
Timeline
  • 19 MAY 12:30Z
    Same-origin policy bypass in the Networking: JAR component
    cvelistv5