CVE-2026-18430
HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reason
- State
- Published
- Severity
- 7.2 High
- Published
- Aug 19, 2026
- Updated
- Aug 19, 2026
- Reserved
- Jul 30, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.2 High | 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 | Fluid Attacks |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
HumHubHumHub |
|
References
- https://fluidattacks.com/es/advisories/personajesthird-party-advisory
- https://github.com/humhub/humhub/pull/8365patch
- https://github.com/humhub/humhubproduct
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