CVE-2026-116881
Received Received - Intake

Cross-Site Scripting in Semantic MediaWiki

Publication date: 2026-10-27

Last updated on: 2026-10-27

Assigner: VulnCheck

Description
Semantic MediaWiki from 3.0.0 before 7.3.1 contains a cross-site scripting vulnerability that allows attackers to inject markup by storing malicious semantic property values rendered unescaped in autocomplete suggestions. When another user opens the property-value autocomplete with an empty query, jquery.autocomplete.js concatenates the raw PValueLookup API value into HTML via container.html(), altering the dropdown and potentially executing script.

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Meta Information

Published
2026-10-27
Last Modified
2026-10-27
Generated
2026-10-27
AI Q&A
2026-10-27
EPSS Evaluated
N/A
NVD
CVE-2026-116881
EUVD
EUVD-2026-110709

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
SemanticMediaWiki SemanticMediaWiki 3.0.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a cross-site scripting (XSS) vulnerability in Semantic MediaWiki versions 3.0.0 through 7.3.0. Attackers can inject malicious scripts by storing unescaped semantic property values that are rendered in autocomplete suggestions. When a user opens the autocomplete dropdown with an empty query, the raw API response is inserted into HTML without sanitization, allowing script execution in the user's session.

Impact Analysis

An attacker could manipulate the autocomplete dropdown UI or execute arbitrary JavaScript in your browser session. This might lead to session hijacking, data theft, or unauthorized actions on your behalf within the Semantic MediaWiki application.

Mitigation Strategies
  • Upgrade Semantic MediaWiki to version 7.3.1 or later to address the XSS flaw in autocomplete suggestions.
  • Review and sanitize all stored semantic property values to ensure no malicious markup is present.
  • Implement HTML escaping for API responses used in autocomplete features to prevent unescaped injection.
  • Add regression tests for empty queries with potentially malicious values to detect similar issues.

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