CVE-2018-12395
High
CVE-2018-12395
By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.
Exploit probability
2.9%
Published
February 28, 2019
Required by
Not available
Last source change
April 16, 2026
02 / AFFECTED SOFTWARE
Affected packages
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
Open Source Vulnerabilities
CVE-2018-12395
View original source
By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.
05 / REFERENCES
Further evidence
- http://www.securityfocus.com/bid/105718
- http://www.securitytracker.com/id/1041944
- https://access.redhat.com/errata/RHSA-2018:3005
- https://access.redhat.com/errata/RHSA-2018:3006
- https://bugzilla.mozilla.org/show_bug.cgi?id=1467523
- https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html
- https://security.gentoo.org/glsa/201811-04
- https://usn.ubuntu.com/3801-1/
- https://www.debian.org/security/2018/dsa-4324
- https://www.mozilla.org/security/advisories/mfsa2018-26/
- https://www.mozilla.org/security/advisories/mfsa2018-27/