{"id":"CVE-2026-61503","summary":"Rejetto HFS \u003c 3.2.1 Username Enumeration via Login Response Differences","details":"Rejetto HFS 3.0.0 through 3.2.0 returns observably different responses from its login endpoint depending on whether the submitted username exists. A remote unauthenticated attacker can use this to confirm valid account names, including the default admin account, facilitating password-guessing and session-forgery attacks.","modified":"2026-07-17T03:41:40.717188559Z","published":"2026-07-13T17:23:20.688Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-204"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61503.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61503.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61503"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/rejetto-hfs-username-enumeration-via-login-response-differences"},{"type":"FIX","url":"https://github.com/rejetto/hfs/releases/tag/v3.2.1"},{"type":"PACKAGE","url":"https://github.com/rejetto/hfs"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rejetto/hfs","events":[{"introduced":"72b005c14cd3d11e0ef3afa3c9fa46bc07af444a"},{"fixed":"15f0eb32f856016b6a3a04c8679b9a12eb18c203"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"3.0.0"},{"fixed":"3.2.1"}]}}],"versions":["v3.2.0","v3.1.7","v3.1.5","v3.1.4","v3.1.3","v3.1.2","v3.1.1","v3.1.0","v3.1.0-rc12","v3.1.0-rc11","v3.1.0-rc10","v3.1.0-rc9","v3.1.0-rc8","v3.0.7","v3.1.0-rc7","v3.1.0-beta6","v3.1.0-beta5","v3.1.0-beta4","v3.1.0-alpha3","v3.1.0-alpha1","v3.0.6","v3.0.5","v3.0.4","v3.0.3","v3.0.2","v3.0.1","v3.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61503.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}