Vulnerability in The Wikimedia Foundation MediaWiki Wikibase extension

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund30 Sep 2026WID-SEC-2026-3693

  MediaWiki Extensions: Multiple vulnerabilities Translated from German

  CVE-2026-103446CVE-2026-103445CVE-2026-103444+9 more CVEs

[ References ]References

• gerrit.wikimedia.org/r/q/Id35bf747e48370e474d9b9444bd7520b24836e8d
• phabricator.wikimedia.org/T435210