CVE-2026-100240
Received Received - Intake

Missing Authorization in MediaWiki TemplateSandbox Extension

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: wikimedia-foundation

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100240
EUVD
EUVD-2026-89034

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
wikimedia mediawiki_templatesandbox_extension to 1.46.1 (exc)
wikimedia mediawiki_templatesandbox_extension 1.45.5
wikimedia mediawiki_templatesandbox_extension 1.43.10

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is a Missing Authorization issue in the Wikimedia Foundation's MediaWiki TemplateSandbox Extension. It allows attackers to access functionality that should be restricted by access control lists (ACLs). The flaw exists in versions before 1.46.1, 1.45.5, and 1.43.10.

Impact Analysis

An attacker could exploit this to perform unauthorized actions within the TemplateSandbox Extension, potentially modifying templates or accessing restricted content. This could lead to data leaks, unauthorized edits, or disruption of wiki functionality.

Compliance Impact

This vulnerability could violate compliance requirements that mandate strict access controls for sensitive data, such as GDPR's data protection principles or HIPAA's safeguards for protected health information. Unauthorized access risks non-compliance.

Mitigation Strategies

Update Mediawiki - TemplateSandbox Extension to version 1.46.1, 1.45.5, or 1.43.10 or later to address the missing authorization issue.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-100240. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart