CVE-2026-29052
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
2Description
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.
Analysis
HumHub Calendar module versions prior to 1.8.11 contain a stored XSS vulnerability in Event Types that allows attackers to inject malicious scripts viewed by users accessing events created by administrative accounts. An attacker with event creation privileges can execute arbitrary JavaScript in the browsers of users viewing affected events, potentially compromising session tokens or sensitive information. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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External POC / Exploit Code
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