CVE-2026-103443: The Wikimedia Foundation Mediawiki Collection Book Extension

Low severity, CVSS 1.1. EPSS: 0.2% 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 Collection (Book) extension allows XSS Targeting Non-Script Elements. This issue affects MediaWiki Collection (Book) extension: 1.46, 1.45, and 1.43.

Affected products

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

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