{"id":"CVE-2023-49278","aliases":["GHSA-7x74-h8cw-qhxq"],"url":"https://o3.security/vulnerability/CVE-2023-49278","summary":"Umbraco CMS brute force exploit can be used to collect valid usernames","details":"Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.4, a brute force exploit can be used to collect valid usernames. Versions 8.18.10, 10.8.1, and 12.3.4 contain a patch for this issue.","published":"2023-12-12T19:14:02.789Z","modified":"2026-07-15T01:49:12.169935880Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"NuGet","name":"Umbraco.CMS","fixedVersion":"8.18.10"},{"ecosystem":"NuGet","name":"Umbraco.CMS","fixedVersion":"10.8.1"},{"ecosystem":"NuGet","name":"Umbraco.CMS","fixedVersion":"12.3.4"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/49xxx/CVE-2023-49278.json"},{"type":"ADVISORY","url":"https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-7x74-h8cw-qhxq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-49278"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:12.169935880Z"}}