CVE-2026-100240 Wikimedia Foundation Mediawiki - Broken Access Control

Wikimedia Foundation Mediawiki - TemplateSandbox Extension < 1.46.1, 1.45.5, 1.43.10 contains a missing authorization vulnerability caused by improper access control in functionality, letting attackers access functionality not properly constrained by ACLs, exploit requires no special privileges.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.30% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-862

Vendor fix

Update to version 1.46.1, 1.45.5, 1.43.10 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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