CVE-2018-12396

MediumCVSS 6.5/10Last modified Jun 17, 2026

Description

A vulnerability where a WebExtension can run content scripts in disallowed contexts following navigation or other events. This allows for potential privilege escalation by the WebExtension on sites where content scripts should not be run. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.

Metrics

CVSS 3.0 6.5/10CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-732

Affected software

Vendor	Product	Versions
Mozilla	Firefox ESR	>= unspecified, < 60.3
Mozilla	Firefox	>= unspecified, < 63

References

http://www.securityfocus.com/bid/105718Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041944Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:3005Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3006Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1483602Broken Link, Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/11/msg00008.htmlThird Party Advisory
https://security.gentoo.org/glsa/201811-04Third Party Advisory
https://usn.ubuntu.com/3801-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4324Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-26/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-27/Vendor Advisory
http://www.securityfocus.com/bid/105718Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041944Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:3005Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3006Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1483602Broken Link, Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/11/msg00008.htmlThird Party Advisory
https://security.gentoo.org/glsa/201811-04Third Party Advisory
https://usn.ubuntu.com/3801-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4324Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-26/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-27/Vendor Advisory

Timeline

Published: Feb 28, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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