XSS in Humhub
CVE-2026-18430
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.
Vulnerability class: XSS (Cross-Site Scripting)
Affected products
- Humhub — versions 1.18.4
Weakness classification (CWE)
References
- help@fluidattacks.com (third-party-advisory)
- help@fluidattacks.com (patch)
- help@fluidattacks.com (product)