CVE-2026-100376

MediumCVSS 4.8

Published: 25/09/2026(UTC)Updated: 28/09/2026(UTC)Translated: 26/09/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.30%

20th percentile - higher than 20% of all known CVEs

Summary

Cross-Site Scripting (XSS) vulnerability in Mediawiki TemplateSandbox Extension due to improper input neutralization during web page generation. Affects versions before 1.46.1, 1.45.5, and 1.43.10.

Risk Assessment

An attacker can exploit XSS to execute malicious scripts in the victim's browser, potentially leading to session theft or other harmful actions.

Recommendation

Update the TemplateSandbox extension to version 1.46.1, 1.45.5, or 1.43.10 or later that contains the fix.

Other vulnerabilities in Mediawiki TemplateSandbox Extension

CVE-2026-100240Critical
Missing Authorization vulnerability in the TemplateSandbox extension for MediaWiki allows access to functionality not properly constrained by ACLs. Affects versions before 1.46.1, 1.45.5, and 1.43.10.

Original NVD description (English source)

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - TemplateSandbox Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - TemplateSandbox Extension: from * before 1.46.1, 1.45.5, 1.43.10.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS