Quick answers
- Is CVE-2026-126562 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-126562 being exploited in the wild.
- How severe is CVE-2026-126562?
- Medium severity, with a CVSS score of 4.3, published 11 November 2026.
- Which products and versions are affected?
- Semantic MediaWiki 3.0.0 before 7.4.1.
- Is there a fix for CVE-2026-126562?
- 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-2026-126562 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-126562?
- 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
An uncontrolled recursion vulnerability exists in the ElasticStore ConceptDescriptionInterpreter component, which only detects directly self-referencing concepts but fails to prevent mutually or transitively referencing concepts (A→B→A). Attackers with page-edit rights can trigger the vulnerability via concept page views, Special:Ask queries, or api.php action=ask requests. The fix tracks active concepts during expansion to detect and break cycles.
Affected products
- Semantic MediaWiki Semantic MediaWiki 3.0.0 before 7.4.1
Timeline
- 2026-11-11: disclosed