CVE-2026-100237 Stored i18n XSS in the Flow integration of Thanks
Stored XSS in the MediaWiki Thanks Extension allows attackers to inject malicious scripts, potentially leading to session hijacking or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-100237?
CVE-2026-100237 is a medium-severity cross-site scripting vulnerability in The Wikimedia Foundation Mediawiki - Thanks Extension, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - Thanks Extension allows Stored XSS.
This issue affects Mediawiki - Thanks Extension: from * before 1.43.10/1.45.5/1.46.1.
Weakness: CWE-79
Which versions are affected by CVE-2026-100237?
How do I fix CVE-2026-100237?
No fix has been published for CVE-2026-100237 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-2026-100237 being exploited?
There is no known exploitation of CVE-2026-100237 in the wild and no public exploit code.
Sources
Also known as GHSA-vfcj-hxgx-8jpc.