CVE-2026-103439: The Wikimedia Foundation Mediawiki Wikbase Extension

Low severity, CVSS 0.3. EPSS: 0.1% chance of exploitation in the next 30 days.

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki Wikbase extension allows Cross-Site Scripting (XSS). This issue affects MediaWiki Wikbase extension: 1.46, 1.45, and 1.43.

Affected products

• The Wikimedia Foundation Mediawiki Wikbase Extension: version 1.46 only; version 1.45 only; version 1.43 only

Published 2026-09-30. Last modified 2026-09-30.