CVE-2026-103438 Various rawParams() and escaped() updates to prevent XSS in Wikistories extension
An XSS vulnerability in the MediaWiki Wikistories extension allows attackers to inject malicious scripts into web pages viewed by other users.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-103438?
CVE-2026-103438 is a low-severity cross-site scripting vulnerability in The Wikimedia Foundation MediaWiki Wikistories extension, published on 30 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki Wikistories extension allows Cross-Site Scripting (XSS).
This issue affects MediaWiki Wikistories extension: 1.46, 1.45, and 1.43.
Weakness: CWE-80
Which versions are affected by CVE-2026-103438?
How do I fix CVE-2026-103438?
No fix has been published for CVE-2026-103438 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-103438 being exploited?
There is no known exploitation of CVE-2026-103438 in the wild and no public exploit code.
Sources
Also known as GHSA-9jgx-vg2f-mrmp.