CVE-2026-18756 — HumHub Community Edition 1.18.4-pl1 - Reflected XSS in Space membership request button rendering
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 butto…
Published: 2026-08-19 · CVSS: 7.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7