HumHub 1.18.4 contains a stored cross-site scripting vulnerability in the comment-deletion notification flow. A Space administrator can delete another user's comment, choose to notify the original author, and place HTML/JavaScript in the deletion reason.

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Fixes

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Workaround

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History

Wed, 19 Aug 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 19 Aug 2026 16:00:00 +0000

Type Values Removed Values Added
Description HumHub 1.18.4 contains a stored cross-site scripting vulnerability in the comment-deletion notification flow. A Space administrator can delete another user's comment, choose to notify the original author, and place HTML/JavaScript in the deletion reason.
Title HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reason
First Time appeared Humhub
Humhub humhub
Weaknesses CWE-79
CPEs cpe:2.3:a:humhub:humhub:1.18.4:*:linux:*:*:*:*:*
cpe:2.3:a:humhub:humhub:1.18.4:*:macos:*:*:*:*:*
cpe:2.3:a:humhub:humhub:1.18.4:*:windows:*:*:*:*:*
Vendors & Products Humhub
Humhub humhub
References
Metrics cvssV4_0

{'score': 7.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: Fluid Attacks

Published:

Updated: 2026-08-19T19:21:03.424Z

Reserved: 2026-07-30T19:14:38.414Z

Link: CVE-2026-18430

cve-icon Vulnrichment

Updated: 2026-08-19T19:20:54.892Z

cve-icon NVD

Status : Received

Published: 2026-08-19T16:17:06.463

Modified: 2026-08-19T20:17:13.353

Link: CVE-2026-18430

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-19T18:15:03Z

Weaknesses