CVE-2018-12396

Name: CVE-2018-12396
Creator: NVD / NIST
Published: 2019-02-28T18:29:00.807+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.27%

Last modified Jun 17, 2026

CVE-2018-12396 is a vulnerability of currently unknown severity. 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. EPSS estimates a 2.27% chance of exploitation in the next 30 days.

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

EPSS Probability

2.27%

80.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-732

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 63.0
Mozilla	Firefox Esr	< 60.3
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	18.10
Redhat	Enterprise Linux Desktop	6.0
Redhat	Enterprise Linux Desktop	7.0
Redhat	Enterprise Linux Server	6.0
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Server Aus	7.6
Redhat	Enterprise Linux Server Eus	7.6
Redhat	Enterprise Linux Server Tus	7.6
Redhat	Enterprise Linux Workstation	6.0
Redhat	Enterprise Linux Workstation	7.0

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
Status: Modified

Frequently Asked Questions

What is CVE-2018-12396?

How severe is CVE-2018-12396?

Severity scoring for CVE-2018-12396 is pending analysis. The EPSS model estimates a 2.27% probability of exploitation in the next 30 days.

How do I fix CVE-2018-12396?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-12396?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST