CVE-2026-8960CWE-290

CVE-2026-8960

High · published May 19, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
33.4
In the wild
Unconfirmed
What it is

Spoofing issue in WebExtensions. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00403 · 33.4th percentile
Weakness
CWE-290 · Authentication Bypass by Spoofing
Published
2026-05-19T18:16Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 151.0.0151.0.0
mozilla/thunderbird< 151.0.0151.0.0
References (3)
https://bugzilla.mozilla.org/show_bug.cgi?id=1940116 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-46/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-50/ · [email protected]
EPSS history
Timeline
  • 19 MAY 12:29Z
    Spoofing issue in WebExtensions
    cvelistv5