CVE-2026-126561 Semantic MediaWiki 2.5.0 before 7.4.1 Missing Authorization via Is edit protected Annotation
Editors lacking edit rights can lock pages with an annotation, blocking other editors and admins indefinitely; Semantic MediaWiki operators should care.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-126561?
CVE-2026-126561 is a high-severity missing authorization vulnerability in SemanticMediaWiki, published on 11 Nov 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Semantic MediaWiki 2.5.0 before 7.4.1 contains a missing authorization vulnerability that allows editors without the edit-protection right to lock pages by adding an Is edit protected annotation. Attackers can add [[Is edit protected::true]] to pages or #set it in widely transcluded templates, so the TitleQuickPermissions hook blocks other editors and administrators from editing, moving or deleting them indefinitely.
Weakness: CWE-862
Which versions are affected by CVE-2026-126561?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-126561?
No fix has been published for CVE-2026-126561 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-2026-126561 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-126561 exists.
Sources
Also known as GHSA-9w3p-9m8x-j2mw, GHSA-vw39-q2rg-9qg8.