---
id: CVE-2026-100240
title: TemplateSandbox does not check read permissions for the page being previewed
summary: >-
  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…
severity: none
cwe:
  - CWE-862
vendor: Wikimedia Foundation
product: Mediawiki - TemplateSandbox Extension
affected:
  - 'mediawiki_-_templatesandbox_extension < 1.46.1, 1.45.5, 1.43.10'
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T16:26:31.215Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-100240'
references:
  - url: 'https://phabricator.wikimedia.org/T407974'
  - url: 'https://gerrit.wikimedia.org/r/q/Iaf9f6e2280798af5516197257ddc0264b9ad9fb7'
tags:
  - cve.org
ingestedAt: '2026-09-29T16:39:33.274Z'
---

## Overview

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.

## Affected

- `mediawiki_-_templatesandbox_extension < 1.46.1, 1.45.5, 1.43.10`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.