Vulnerability · Published Jul 13, 2026 · Assigned by VulnCheck
CVE-2026-61503Rejetto HFS < 3.2.1 Username Enumeration via Login Response Differences
Medium 5.3
In plain English
A medium-severity security flaw in hfs from rejetto. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 61.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-204 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- hfs v3.2.1 Release Notes release-notes, patch
- https://www.vulncheck.com/advisories/rejetto-hfs-username-enumeration-via-login-response-differences third-party-advisory