Medium severity · published Sep 29, 2026
CVE-2026-100245
Stored XSS on Wikibase Special:SetSiteLink via unescaped system message
6.1
CVSS
0.2%
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 Stored XSS.
This issue affects Mediawiki - Wikibase Extension: from * before 1.46.1, 1.45.5, 1.43.10.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% 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-2026-100245
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100245
phabricator.wikimedia.org
https://phabricator.wikimedia.org/T432877
gerrit.wikimedia.org
https://gerrit.wikimedia.org/r/q/If871fa7684d42dae057c0517d4a17132cd7aefeb
More from Mediawiki - Wikibase Extension
5.3
CVE-2026-100380
Reflected XSS in Wikibase Special:SetLabel language validation