---
id: CVE-2026-29052
title: >-
  The Calendar module for HumHub enables users to create one-time or recurring
  events, manage attendee invitations, and efficiently track all scheduled
  activities
summary: >-
  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 …
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: humhub
product: calendar
affected:
  - calendar < 1.8.11
patched:
  - calendar 1.8.11
published: '2026-03-05'
updated: '2026-09-02'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-29052'
references:
  - url: 'https://github.com/humhub/calendar/releases/tag/v1.8.11'
    label: security-advisories@github.com
  - url: 'https://github.com/humhub/calendar/security/advisories/GHSA-gqj3-pmp2-mrx8'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00155
epssPercentile: 0.04998
ingestedAt: '2026-09-02T14:45:28.430Z'
---

## Overview

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

- `calendar < 1.8.11`

## Remediation

Upgrade past the affected range:

- `calendar 1.8.11`