All vulnerabilities
CVE-2026-100240

TemplateSandbox does not check read permissions for the page being previewed

Wikimedia Foundation Mediawiki - TemplateSandbox ExtensionApplications & CMS
Open in ThreatlineRecord JSON
CVSS
9.1Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.30%Chance of exploitation activity in the next 30 days, higher than 21% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.46.1, 1.45.5, 1.43.10Fixed versionCVE List
Published29 Sep 2026Updated 1 Oct 2026CVE List

What fixes it

  • 1.46.1, 1.45.5, 1.43.10Mediawiki - TemplateSandbox ExtensionCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

Missing Authorization vulnerability in Wikimedia Foundation Mediawiki - TemplateSandbox Extension allows Accessing Functionality Not Properly Constrained by ACLs.

This issue affects Mediawiki - TemplateSandbox Extension: from * before 1.46.1, 1.45.5, 1.43.10.

Text from CVE List

Affected versions 1

  • Mediawiki - TemplateSandbox Extensionaffected: * before 1.46.1, 1.45.5, 1.43.10CVE List

References 2