CVE-2026-103050: The Wikimedia Foundation Mediawiki - Massmessage Extension

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - MassMessage extension allows Stored XSS. This issue affects Mediawiki - MassMessage extension: before 1.46.1, 1.45.5, 1.43.10.

Affected products

• The Wikimedia Foundation Mediawiki - Massmessage Extension

Published 2026-09-30. Last modified 2026-09-30.