All vulnerabilities
CVE-2026-100376

TemplateSandbox can be abused for XSS by asking another user to preview a page with a certain sandbox prefix

Wikimedia Foundation Mediawiki - TemplateSandbox ExtensionApplications & CMS
Open in ThreatlineRecord JSON
CVSS
4.8Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.29%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
Published25 Sep 2026Updated 26 Sep 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

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - TemplateSandbox Extension allows Cross-Site Scripting (XSS).

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