CVE-2026-29052: Humhub Calendar

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

The Calendar module for HumHub enables users to create one-time or recurring events, manage attendee invitations, and efficiently track all scheduled activities. Prior to version 1.8.11, a Stored Cross-Site Scripting (XSS) vulnerability in the Event Types of the HumHub Calendar module impacts users viewing events created by an administrative account. This issue has been patched in version 1.8.11.

Affected products

• Humhub Calendar: before 1.8.11 (fixed in 1.8.11)

Published 2026-03-05. Last modified 2026-09-02.