Is CVE-2026-126561 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-126561 being exploited in the wild.

How severe is CVE-2026-126561?

High severity, with a CVSS score of 7.1, published 11 November 2026.

Which products and versions are affected?

Semantic MediaWiki 2.5.0 before 7.4.1.

Is there a fix for CVE-2026-126561?

Yes: fixed in 7.4.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-126561 attacked?

It is attacked over the network.

Am I affected by CVE-2026-126561?

Check whether you run Semantic MediaWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-126561: Semantic MediaWiki missing authorization in page edit protection

CVE-2026-126561 · Severity: high · CVSS 7.1 · Published 2026-11-11

Semantic MediaWiki is a semantic annotation and knowledge management system for wikis. Editors without the necessary permissions can lock pages indefinitely by adding a special annotation, preventing other editors and administrators from modifying or deleting those pages. An attacker can exploit this by adding annotations to widely transcluded templates to cause mass lockdown of pages across the wiki.

Technologies: Semantic MediaWiki. Vendors: Semantic MediaWiki.

Quick answers

Is CVE-2026-126561 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-126561 being exploited in the wild.
How severe is CVE-2026-126561?: High severity, with a CVSS score of 7.1, published 11 November 2026.
Which products and versions are affected?: Semantic MediaWiki 2.5.0 before 7.4.1.
Is there a fix for CVE-2026-126561?: Yes: fixed in 7.4.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-126561 attacked?: It is attacked over the network.
Am I affected by CVE-2026-126561?: Check whether you run Semantic MediaWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 7.4.1

Technical details

The ProtectionValidator component fails to check user permissions before honoring the "Is edit protected" (_EDIP) annotation. Editors lacking the edit-protection right can set [[Is edit protected::true]] directly or via template parameters, causing the TitleQuickPermissions hook to block all editing access without applying actual MediaWiki restrictions. The fix validates that a matching MediaWiki edit restriction exists before enforcing the annotation.

Affected products

Semantic MediaWiki Semantic MediaWiki 2.5.0 before 7.4.1

Timeline

2026-11-11: disclosed

References

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