CVE-2026-58517
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
A vulnerability in the WikiLambda extension for MediaWiki allows authentication bypass due to improper neutralization of input terminators. Affects versions before 1.43.9, 1.44.6, and 1.45.4.
Risk Assessment
An attacker can bypass authentication mechanisms, gaining unauthorized access to extension features, potentially leading to data integrity compromise and privilege escalation.
Recommendation
Immediately update the WikiLambda extension to version 1.43.9, 1.44.6, or 1.45.4 depending on your MediaWiki branch.
Other vulnerabilities in MediaWiki - WikiLambda Extension
See all- CVE-2026-100383Medium
The WikiLambda extension in MediaWiki contains an XSS (Cross-Site Scripting) vulnerability due to improper input neutralization during web page generation. The issue affects version 1.47.0-alpha and has been remediated on the master branch.
- CVE-2026-100377Medium
Vulnerability of sensitive information exposure to unauthorized actor in Mediawiki WikiLambda Extension. Affects version 1.47.0-alpha and has been remediated on the master branch.
- CVE-2026-96872Low
The WikiLambda extension for MediaWiki before version 1.47.0 has improper handling of insufficient permissions, allowing access to functionality not properly constrained by ACLs. The issue affects Linux, MacOS, and Windows.
Original NVD description (English source)
Improper neutralization of input terminators vulnerability in The Wikimedia Foundation Mediawiki - WikiLambda Extension allows Authentication Bypass. This issue affects Mediawiki - WikiLambda Extension: from * before 1.43.9,1.44.6,1.45.4.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS