{"id":"CVE-2026-18430","summary":"HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reason","details":"HumHub 1.18.4 contains a stored cross-site scripting vulnerability in the comment-deletion notification flow. A Space administrator can delete another user's comment, choose to notify the original author, and place HTML/JavaScript in the deletion reason.","modified":"2026-08-21T03:46:23.400642981Z","published":"2026-08-19T15:52:49.273Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18430.json","cna_assigner":"Fluid Attacks","cwe_ids":["CWE-79"]},"references":[{"type":"ADVISORY","url":"https://fluidattacks.com/es/advisories/personajes"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18430.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18430"},{"type":"FIX","url":"https://github.com/humhub/humhub/pull/8365"},{"type":"PACKAGE","url":"https://github.com/humhub/humhub"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/humhub/humhub","events":[{"introduced":"3320c4140371b62d8694eeaf943e606d902f007a"},{"last_affected":"3320c4140371b62d8694eeaf943e606d902f007a"}],"database_specific":{"extracted_events":[{"introduced":"1.18.4"},{"last_affected":"1.18.4"}],"source":"AFFECTED_FIELD"}}],"versions":["1.18.4","v1.18.4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-18430.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N"}]}