{"id":"CVE-2026-18756","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-18756","summary":"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…","details":"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.","published":"2026-08-19T15:16:58.150","modified":"2026-08-19T15:16:58.150","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/humhub/humhub/pull/8381","label":"humhub/humhub#8381"},"references":[{"type":"WEB","url":"https://fluidattacks.com/es/advisories/turizo"},{"type":"WEB","url":"https://github.com/humhub/humhub"},{"type":"WEB","url":"https://github.com/humhub/humhub/pull/8381"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-19T15:16:58.150"}}