{"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":"#### Impact\nA brute force exploit that can be used to collect valid usernames is possible.\n\n#### Explanation of the vulnerability \nIt's a brute force exploit that can be used to collect valid usernames by using the “forgot password” function when trying to log into the Backoffice.\nIf the username/email is known, it is easier to find the corresponding password.\nIf an email address that was already used and registered by a user, is provided as an input, the server internal processing time takes longer.\nIf the email address does not exist in the database of the registered users, the server would respond immediately.","published":"2023-12-12T19:14:02.789Z","modified":"2026-08-12T03:51:19.812027746Z","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":{"score":0.005,"percentile":0.40774,"asOf":"2026-08-23"},"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"},{"type":"PACKAGE","url":"https://github.com/umbraco/Umbraco-CMS"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:19.812027746Z"}}