CVE-2026-100245
Received Received - Intake

Stored XSS in MediaWiki Wikibase Extension

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: wikimedia-foundation

Description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Wikibase Extension allows Stored XSS. This issue affects Mediawiki - Wikibase Extension: from * before 1.46.1, 1.45.5, 1.43.10.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100245
EUVD
EUVD-2026-89092

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
wikimedia_foundation mediawiki_wikibase_extension to 1.46.1 (exc)
wikimedia_foundation mediawiki_wikibase_extension 1.45.5
wikimedia_foundation mediawiki_wikibase_extension 1.43.10

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.

Attack-Flow Graph

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Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Wikimedia Foundation MediaWiki Wikibase Extension. It allows attackers to inject malicious scripts into web pages that are then stored on the server and served to other users. The issue exists in versions before 1.46.1, 1.45.5, and 1.43.10.

Impact Analysis

An attacker could exploit this to steal user sessions, deface web pages, or deliver malware to visitors. Users accessing affected Wikibase pages may unknowingly execute malicious scripts, leading to data theft or unauthorized actions on their behalf.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Organizations may face compliance breaches if user data is compromised through this XSS flaw.

Mitigation Strategies

Update MediaWiki Wikibase Extension to version 1.46.1, 1.45.5, or 1.43.10 or later to address the XSS vulnerability.

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