CVE-2026-18526
HumHub 1.18.4 / 1.18.4-pl1 – Stored Cross-Site Scripting in oEmbed confirmation
- State
- Published
- Severity
- 7.4 High
- Published
- Aug 19, 2026
- Updated
- Aug 21, 2026
- Reserved
- Jul 31, 2026
Description
HumHub Community Edition 1.18.4 and 1.18.4-pl1 contain a stored Cross-Site Scripting (XSS) vulnerability in the oEmbed confirmation rendering workflow.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.4 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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/advisories/greeicythird-party-advisory
- https://github.com/humhub/humhubproduct
- https://github.com/humhub/humhub/pull/8373patch
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