{"id":"CVE-2026-61503","title":"Rejetto HFS < 3.2.1 Username Enumeration via Login Response Differences","summary":"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 t…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cvssSource":"cna","cwe":["CWE-204"],"vendor":"rejetto","product":"hfs","affected":["hfs >= 3.0.0 < 3.2.1"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-07-15T19:07:07.143075Z"},"published":"2026-07-13","updated":"2026-10-01","sourceUpdated":"2026-10-01T15:20:11.068Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-61503","references":[{"url":"https://github.com/rejetto/hfs/releases/tag/v3.2.1","label":"hfs v3.2.1 Release Notes"},{"url":"https://www.vulncheck.com/advisories/rejetto-hfs-username-enumeration-via-login-response-differences"}],"tags":["cve.org"],"epss":0.00436,"epssPercentile":0.35603,"ingestedAt":"2026-10-01T15:48:17.860Z","slug":"CVE-2026-61503","body":"## Overview\n\nRejetto 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.\n\n## Affected\n\n- `hfs >= 3.0.0 < 3.2.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}