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TI-2026-23197 Aliases CVE-2026-29052

HumHub Calendar Module: Stored XSS in Event Types

Priority LOW 36CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

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 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00186 8th percentileScored 2026-11-07
Fix Fixed calendar (humhub): 1.8.11

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
humhubcalendarbefore 1.8.111.8.11Patch availableCNA
  • calendar Vendorhumhub Affected before 1.8.11 Fixed in 1.8.11 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:humhub:calendar:*:*:*:*:*:humhub:*:*before 1.8.11Vulnerablehumhub
  • cpe:2.3:a:humhub:calendar:*:*:*:*:*:humhub:*:* Versions before 1.8.11 Vulnerable ·humhub

Remediation

  • Fix · CNA calendar (humhub) Fixed in 1.8.11

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-29052

References

Advisory 1

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences