CVE-2025-32077: The Wikimedia Foundation Mediawiki - Extension:simplecalendar

Medium severity, CVSS 6.9. EPSS: 0.4% chance of exploitation in the next 30 days.

Improper Input Validation vulnerability in The Wikimedia Foundation Mediawiki - Extension:SimpleCalendar allows Cross-Site Scripting (XSS).This issue affects Mediawiki - Extension:SimpleCalendar: from 1.39 through 1.43.

Affected products

• The Wikimedia Foundation Mediawiki - Extension:simplecalendar: from 1.39, up to and including 1.43

Published 2025-04-11. Last modified 2026-06-17.