{"id":"CVE-2026-18430","aliases":["EUVD-2026-62546"],"status":"published","title":"HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reason","description":"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.","severity":{"version":"4.0","score":7.2,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00466,"percentile":0.40774,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-08-19T15:52:49Z","modified":"2026-10-29T02:30:35Z","products":[{"vendor":"humhub","product":"humhub"}],"references":[{"url":"https://fluidattacks.com/es/advisories/personajes","tags":["third-party-advisory","exploit","advisory"]},{"url":"https://github.com/humhub/humhub/pull/8365","tags":["patch","fix"]},{"url":"https://github.com/humhub/humhub","tags":["product","package"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18430.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18430","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-18430","title":"HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reason","description":"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.","status":"published","published":"2026-08-19T15:52:49.273Z","modified":"2026-08-19T19:21:03.424Z","cvss":[{"version":"4.0","score":7.2,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:20:12.60856Z"}],"euvd":[{"id":"EUVD-2026-62546","description":"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.","status":"published","published":"2026-08-19T15:52:49Z","modified":"2026-08-19T19:21:03Z","cvss":[{"version":"4.0","score":7.2,"vector":"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","level":"high"}],"updated_at":"2026-11-02T18:01:40.9092Z"}],"nvd":[{"id":"CVE-2026-18430","description":"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.","status":"published","published":"2026-08-19T16:17:06.463Z","modified":"2026-10-27T11:10:00.193Z","cvss":[{"version":"4.0","score":7.2,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:39.962615Z"}],"osv":[{"id":"CVE-2026-18430","title":"HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reason","description":"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.","status":"published","published":"2026-08-19T15:52:49.273Z","modified":"2026-10-29T02:30:35.982050112Z","cvss":[{"version":"4.0","score":7.2,"vector":"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","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:44:58.024074Z"}]}}