CVE-2026-74960EPSS p11.9%

CVE-2026-74960CVE-2026-74960

mozilla / firefox

Description

Site isolation issue in the WebExtensions component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Scoring

CVSS 8.1 ()
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
EPSS0.22% probability of exploitation · percentile 11.9% · 2026-10-06T12:00:23Z
Last modified2026-08-24
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.