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CVE-2026-100380

Reflected XSS in Wikibase Special:SetLabel language validation

Wikimedia Foundation Mediawiki - Wikibase ExtensionApplications & CMS
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.33%Chance of exploitation activity in the next 30 days, higher than 24% 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 - Wikibase 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 - Wikibase Extension allows Cross-Site Scripting (XSS).

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

Text from CVE List

Affected versions 1

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

References 2