CVE-2026-0669 Path Traversal vulnerability in CSS extension on certain web servers
Path traversal in MediaWiki CSS extension allows attackers to read arbitrary files on the server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-0669?
CVE-2026-0669 is a high-severity path traversal vulnerability in Wikimedia Foundation MediaWiki - CSS extension, published on 7 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Wikimedia Foundation MediaWiki - CSS extension allows Path Traversal.This issue affects MediaWiki - CSS extension: 1.44, 1.43, 1.39.
Weakness: CWE-22
Which versions are affected by CVE-2026-0669?
It affects 1 product.
Products include Css Project Css.
How do I fix CVE-2026-0669?
No fix has been published for CVE-2026-0669 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-0669 being exploited?
There is no known exploitation of CVE-2026-0669 in the wild and no public exploit code.
Sources
Also known as GHSA-78qj-mxw5-p7qp.