CVE-2026-100240

TemplateSandbox does not check read permissions for the page being previewed

State: Published
Severity: 9.1 Critical
Published: Sep 29, 2026
Updated: Oct 1, 2026
Reserved: Sep 25, 2026

Description

Missing Authorization vulnerability in Wikimedia Foundation Mediawiki - TemplateSandbox Extension allows Accessing Functionality Not Properly Constrained by ACLs.

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

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	CISA-ADP

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
Mediawiki - TemplateSandbox ExtensionWikimedia Foundation	before 1.46.1, 1.45.5, 1.43.10Affected

References

https://phabricator.wikimedia.org/T407974
https://gerrit.wikimedia.org/r/q/Iaf9f6e2280798af5516197257ddc0264b9ad9fb7

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