CVE-2026-103441: The Wikimedia Foundation Mediawiki Wikibase Extension

High severity, CVSS 7.2. EPSS: 0.3% chance of exploitation in the next 30 days.

Deserialization of untrusted data vulnerability in The Wikimedia Foundation MediaWiki Wikibase extension allows Leverage Executable Code in Non-Executable Files. This issue affects MediaWiki Wikibase extension: 1.46, 1.45, and 1.43.

Affected products

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

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