Medium severity · published Sep 25, 2026
CVE-2026-100380
Reflected XSS in Wikibase Special:SetLabel language validation
5.3
CVSS
0.4%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MW
Mediawiki - Wikibase Extension · Wikimedia Foundation
before 1.46.1, 1.45.5, 1.43.10 · source: vendor
Affected product
MW
Mediawiki - Wikibase Extension
Wikimedia Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100380
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100380
gerrit.wikimedia.org
https://gerrit.wikimedia.org/r/q/I7407f9748d72161ce25ad0ba2446869bb1776857
phabricator.wikimedia.org
https://phabricator.wikimedia.org/T434549
More from Mediawiki - Wikibase Extension
6.1
CVE-2026-100245
Stored XSS on Wikibase Special:SetSiteLink via unescaped system message