CVE-2026-96872 WikiLambda public function execution bypasses the unsaved-code permission through nested Z825 compositions
Attackers can execute unsaved code via nested compositions, bypassing permission checks in the WikiLambda extension.
- 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-2026-96872?
CVE-2026-96872 is a low-severity missing authorization vulnerability in The Wikimedia Foundation Mediawiki - WikiLambda Extension, published on 23 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper handling of insufficient permissions or privileges vulnerability in The Wikimedia Foundation Mediawiki - WikiLambda Extension on Linux, MacOS, and Windows allows Accessing Functionality Not Properly Constrained by ACLs.
This issue affects Mediawiki - WikiLambda Extension: before 1.47.0.
Weakness: CWE-280
Which versions are affected by CVE-2026-96872?
How do I fix CVE-2026-96872?
No fix has been published for CVE-2026-96872 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-96872 being exploited?
There is no known exploitation of CVE-2026-96872 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-c7v9-97f3-3pxf.