CVE-2018-12369

9.8 criticalEPSS 2.5%

Critical (9.8). EPSS 2.5% chance of exploitation in the next 30 days.

WebExtensions bundled with embedded experiments were not correctly checked for proper authorization. This allowed a malicious WebExtension to gain full browser permissions. This vulnerability affects Firefox ESR < 60.1 and Firefox < 61.

Severity

CVSS 3.0

9.8 critical

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 2.5% chance of exploitation in the next 30 days; higher than 84% of CVEs (scores of 2026-10-31)
CWE: CWE-863
Published: 2018-10-18
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

canonical:ubuntu_linux
mozilla:firefox

References

http://www.securityfocus.com/bid/104561
http://www.securitytracker.com/id/1041193
https://bugzilla.mozilla.org/show_bug.cgi?id=1454909
https://security.gentoo.org/glsa/201810-01
https://usn.ubuntu.com/3705-1/

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