CVE-2018-12396

moderate-risk
Published 2019-02-28

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.

Do I need to act?

~
1.1% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (17)

Affected Vendors

Debian Redhat Mozilla Canonical

References (22)

Third Party Advisory http://www.securityfocus.com/bid/105718
Third Party Advisory http://www.securitytracker.com/id/1041944
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3005
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3006
Broken Link https://bugzilla.mozilla.org/show_bug.cgi?id=1483602
Third Party Advisory https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html
Third Party Advisory https://security.gentoo.org/glsa/201811-04
Third Party Advisory https://usn.ubuntu.com/3801-1/
Third Party Advisory https://www.debian.org/security/2018/dsa-4324
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2018-26/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2018-27/
Third Party Advisory http://www.securityfocus.com/bid/105718
Third Party Advisory http://www.securitytracker.com/id/1041944
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3005
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3006
Broken Link https://bugzilla.mozilla.org/show_bug.cgi?id=1483602
Third Party Advisory https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html
Third Party Advisory https://security.gentoo.org/glsa/201811-04
Third Party Advisory https://usn.ubuntu.com/3801-1/
Third Party Advisory https://www.debian.org/security/2018/dsa-4324
and 2 more references
46
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 3/34 · Minimal
Exposure 19/34 · Moderate