CVE-2018-12396

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.

• CWE-732

• 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

Published

Feb 28, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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• CVE-2018-12393A potential vulnerability was found in 32-bit builds where a…
• CVE-2018-12395By rewriting the Host: request headers using the webRequest …
• CVE-2018-12397A WebExtension can request access to local files without the…
• CVE-2018-12398By using the reflected URL in some special resource URIs, su…
• CVE-2018-12399When a new protocol handler is registered, the API accepts a…
• CVE-2018-1240Dell EMC ViPR Controller, versions after 3.0.0.38, contain a…
• CVE-2018-12400In private browsing mode on Firefox for Android, favicons ar…
• CVE-2018-12401Some special resource URIs will cause a non-exploitable cras…