CVE-2026-103437 ReadingLists imported metadata permits JavaScript URL XSS
Reflected XSS in MediaWiki ReadingLists extension allows attackers to execute arbitrary JavaScript via imported metadata.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-103437?
CVE-2026-103437 is a low-severity cross-site scripting vulnerability in The Wikimedia Foundation MediaWiki ReadingLists extension, published on 30 Sep 2026. Any signed-in user can exploit it over the 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 ReadingLists extension allows Reflected XSS.
This issue affects MediaWiki ReadingLists extension: 1.46 and 1.45.
Weakness: CWE-80
Which versions are affected by CVE-2026-103437?
How do I fix CVE-2026-103437?
No fix has been published for CVE-2026-103437 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-2026-103437 being exploited?
There is no known exploitation of CVE-2026-103437 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-c4w7-7m72-q5m9.