CVE-2026-47657
Received Received - Intake

Unauthorized Space Member Removal in HumHub

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: GitHub, Inc.

Description
HumHub is an Open Source Enterprise Social Network. In versions 1.13.0 through 1.18.2, a missing authorization check in the Space member management controller allowed any authenticated user to trigger the removal of all members from any Space, regardless of their own role or membership in that Space. Versions 1.13.0 through 1.18.2 are affected. The vulnerability has been patched in version 1.18.3, and all users are encouraged to upgrade to this version or later immediately. No known workaround is available.

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Meta Information

Published
2026-07-21
Last Modified
2026-07-21
Generated
2026-07-21
AI Q&A
2026-07-21
EPSS Evaluated
N/A
NVD
CVE-2026-47657
EUVD
EUVD-2026-46349

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
humhub humhub From 1.13.0 (inc) to 1.18.2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

CVE-2026-47657 is a vulnerability in HumHub, an open-source enterprise social network. It allows any authenticated user to remove all members from any Space, regardless of their role or membership status. This occurs due to a missing authorization check in the Space member management controller.

Detection Guidance

Check HumHub version with: grep -r '"version"' /path/to/humhub/composer.json. If version is between 1.13.0 and 1.18.2, the system is vulnerable. Review logs for unusual Space member removal events or unauthorized access attempts.

Impact Analysis

This vulnerability could allow unauthorized users to disrupt or delete entire communities within a HumHub instance. It may lead to data loss, compromised collaboration spaces, and potential reputational damage for organizations using the affected versions.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing unauthorized users to remove members from any Space, which may lead to unauthorized data access or loss of access controls. Such actions could violate principles of data protection and access management required by these regulations.

Mitigation Strategies

Upgrade HumHub to version 1.18.3 or later immediately. No workarounds exist, so patching is required. Verify the upgrade was successful by checking the version again.

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