CVE-2026-18756

UNKNOWN 0.0

HumHub Community Edition 1.18.4-pl1 - Reflected XSS in Space membership request button rendering

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

HumHub Community Edition 1.18.4 contains a reflected cross-site scripting vulnerability in the Space membership-request workflow. An attacker can place attacker-controlled button configuration in the options query-string parameter of space/membership/request-membership-form, lure an authenticated non-member into submitting the legitimate membership request form, and cause the server to return JavaScript containing attacker-controlled code.

CWE	CWE-79
Vendor	humhub
Product	humhub
Published	Aug 19, 2026

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Affected Versions

HumHub / HumHub

1.18.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

fluidattacks.com: https://fluidattacks.com/es/advisories/turizo github.com: https://github.com/humhub/humhub github.com: https://github.com/humhub/humhub/pull/8381

Credits

Miguel Gomez Fluid Attacks' AI SAST Scanner