CVE-2026-100383 Stored i18n XSS in WikiLambda's VisualEditor integration
Stored XSS in WikiLambda's VisualEditor allows attackers to inject scripts, potentially compromising user sessions and data integrity.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-100383?
CVE-2026-100383 is a medium-severity cross-site scripting vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension, published on 25 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension allows Cross-Site Scripting (XSS).
This issue affects Mediawiki - WikiLambda Extension: 1.47.0-alpha. The issue has been remediated on the `master` branch.
Weakness: CWE-79
Which versions are affected by CVE-2026-100383?
How do I fix CVE-2026-100383?
No fix has been published for CVE-2026-100383 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-2026-100383 being exploited?
There is no known exploitation of CVE-2026-100383 in the wild and no public exploit code.
Sources
Also known as GHSA-45r6-8hjm-wh6p.