# CVE-2026-126567: Semantic MediaWiki stored XSS in Special:Ask with ElasticStore

Source: https://junglewise.ai/threats/cve-2026-126567-semantic-mediawiki-3-0-0-before-7-4-1-contains-a-stored-cross  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-11. Updated: 2026-11-11  
License: CC BY 4.0 with a link back

CVE-2026-126567 · Severity: medium · CVSS 5.4 · Published 2026-11-11

Semantic MediaWiki is a structured data extension for MediaWiki that powers knowledge bases and data-driven wikis. A stored cross-site scripting flaw in the Special:Ask search interface allows users with edit rights to inject malicious scripts that execute when administrators or other users view crafted search links, potentially leading to account takeover or unauthorized actions.

Technologies: [SemanticMediaWiki Semantic MediaWiki](https://junglewise.ai/threats/technologies/semanticmediawiki-semantic-mediawiki). Vendors: [SemanticMediaWiki](https://junglewise.ai/threats/vendors/semanticmediawiki).

## Quick answers

**Is CVE-2026-126567 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-126567 being exploited in the wild.

**How severe is CVE-2026-126567?** Medium severity, with a CVSS score of 5.4, published 11 November 2026.

**Which products and versions are affected?** SemanticMediaWiki Semantic MediaWiki 3.0.0 to before 7.4.1.

**Is there a fix for CVE-2026-126567?** 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-2026-126567 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-126567?** Check whether you run SemanticMediaWiki 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

A stored XSS vulnerability exists in the Special:Ask page when using the ElasticStore backend, where user-controlled data from Text properties and subobject names is output without proper HTML escaping in the native_result and score_set displays. An attacker with edit rights can store malicious markup in wiki properties, then craft a Special:Ask URL that triggers the vulnerable code path and causes the injected script to execute in the victim's browser session.

## Affected products

- SemanticMediaWiki Semantic MediaWiki 3.0.0 to before 7.4.1

## Timeline

- 2026-11-11: disclosed

## References

- [https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/MediaWiki/Specials/SpecialAsk.php](https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/MediaWiki/Specials/SpecialAsk.php)
- [https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/Query/ScoreSet.php](https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/Query/ScoreSet.php)

## Related threats

- [Semantic MediaWiki reflected XSS in TimeValueFormatter](https://junglewise.ai/threats/cve-2026-126563-semantic-mediawiki-2-4-0-before-7-4-1-contains-a-reflected-cross)
- [Semantic MediaWiki missing authorization in smwtask API](https://junglewise.ai/threats/cve-2026-116890-semantic-mediawiki-from-3-0-0-before-7-3-0-contains-a-missing)
- [Semantic MediaWiki uncontrolled recursion in query parser](https://junglewise.ai/threats/cve-2026-116871-semantic-mediawiki-3-0-0-before-7-3-1-contains-an-uncontrolled)