Vulnerability · Published Mar 5, 2026 · Assigned by GitHub_M

CVE-2026-29052HumHub Calendar Module: Stored XSS in Event Types

Medium 6.9

In plain English

A medium-severity cross-site scripting in calendar from humhub. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.2%top 91.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
humhub	calendar	< 1.8.11

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://github.com/humhub/calendar/security/advisories/GHSA-gqj3-pmp2-mrx8 x_refsource_CONFIRM
https://github.com/humhub/calendar/releases/tag/v1.8.11 x_refsource_MISC