Vulnerability in Wikimedia Foundation Mediawiki - ExternalData Extension

[ Why it matters ]Priority signals

• Critical severity: CVSS 10.0

[ Description ]Official description

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in Wikimedia Foundation Mediawiki - ExternalData Extension allows OS Command Injection. This issue affects Mediawiki - ExternalData Extension: from * before 3.7.

[ 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-Bund27 Sep 2026WID-SEC-2026-3597

  MediaWiki Extensions: Multiple vulnerabilities Translated from German

  CVE-2026-57440CVE-2026-96875CVE-2026-100237+11 more CVEs

[ References ]References

• gerrit.wikimedia.org/r/c/mediawiki/extensions/ExternalData/+/1326012
• phabricator.wikimedia.org/T434961