{"id":"CVE-2026-18526","summary":"HumHub 1.18.4 / 1.18.4-pl1 – Stored Cross-Site Scripting in oEmbed confirmation","details":"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.","modified":"2026-08-30T03:30:14.756630639Z","published":"2026-08-19T14:17:00.896Z","database_specific":{"cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18526.json","cna_assigner":"Fluid Attacks"},"references":[{"type":"ADVISORY","url":"https://fluidattacks.com/advisories/greeicy"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18526.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18526"},{"type":"FIX","url":"https://github.com/humhub/humhub/pull/8373"},{"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":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"1.18.4"},{"last_affected":"1.18.4"}]}}],"versions":["1.18.4","v1.18.4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-18526.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}