Quick answers
- Is CVE-2026-126566 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-126566 being exploited in the wild.
- How severe is CVE-2026-126566?
- High severity, with a CVSS score of 7.1, published 11 November 2026.
- Which products and versions are affected?
- Semantic MediaWiki 7.3.1 before 7.4.1.
- Is there a fix for CVE-2026-126566?
- 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-2026-126566 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-126566?
- 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 EditProtectionUpdater::userMayChangeProtection() function incorrectly validates whether an editor has permission to change page protection settings by checking against the page's latest revision author rather than the current user's actual permissions. An attacker can add {{#set:Is edit protected=false}} to a transcluded template to trigger protection removal; the vulnerable authorization check allows this even for unprivileged editors, effectively allowing them to unprotect pages that administrators have secured.
Affected products
- Semantic MediaWiki Semantic MediaWiki 7.3.1 before 7.4.1
Timeline
- 2026-11-11: disclosed