CVE-2026-18526

EUVD-2026-62415
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.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
Fluid AttacksCNA
7.4 HIGH
NETWORK
LOW
LOW
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
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
humhubhumhub
1.18.4
CNA
Common Weakness Enumeration
References
https://fluidattacks.com/advisories/greeicy
https://github.com/humhub/humhub
https://github.com/humhub/humhub/pull/8373