Vulnerability DatabaseCVE-2026-18526
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CVE-2026-18526
Published:August 19, 2026
Updated:September 24, 2026
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.
Affected Packages
https://github.com/humhub/humhub.git (GITHUB):
Affected version(s) =v1.18.4 <v1.18.5
Fix Suggestion:
Update to version v1.18.5
Related Resources (5)
https://nvd.nist.gov/vuln/detail/CVE-2026-18526
https://github.com/humhub/humhub/pull/8373
https://github.com/humhub/humhub
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18526.json
https://fluidattacks.com/advisories/greeicy
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CVSS v4
Base Score:
7.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-79
EPSS
Base Score:
0.34