by Kastro
Paper/Archive/CVE-2026-74979

CVE-2026-74979

Mozilla Firefox — Mitigation bypass in the Add-ons Manager component

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 44.6.446 × 208.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Mitigation bypass in the Add-ons Manager component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory153.1CNA
Thunderbirdsee advisory153.1CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=2045676refmozilla.org/security/advisories/mfsa2026-74refmozilla.org/security/advisories/mfsa2026-77refmozilla.org/security/advisories/mfsa2026-78refmozilla.org/security/advisories/mfsa2026-80