High severity · published Sep 29, 2026
CVE-2026-100244
CentralAuth exposes locally suppressed block information via globaluserinfo API and Special:CentralAuth (incomplete fix for CVE-2025-62669)
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation Mediawiki - CentralAuth Extension allows Excavation.
This issue affects Mediawiki - CentralAuth Extension: from * before 1.46.1, 1.45.5, 1.43.10.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MC
Mediawiki - CentralAuth Extension · Wikimedia Foundation
before 1.46.1, 1.45.5, 1.43.10 · source: vendor
Affected product
MC
Mediawiki - CentralAuth Extension
Wikimedia Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100244
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100244
phabricator.wikimedia.org
https://phabricator.wikimedia.org/T432789
gerrit.wikimedia.org
https://gerrit.wikimedia.org/r/q/Ifd262c11300dd0355e177d6185bcd704d2720a47
More from Mediawiki - CentralAuth Extension
8.8
CVE-2025-6926
Security Authentication Bypass in CentralAuth