Vulnerability in Rejetto Hfs
CVE-2026-61503
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Rejetto Hfs — versions 3.0.0
Weakness classification (CWE)
References
- hfs v3.2.1 Release Notes (release-notes, patch)
- www.vulncheck.com/advisories/rejetto-hfs-username-enumeration-via-login-respons… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-61503?
- CVE-2026-61503 is a medium-severity vulnerability in Rejetto Hfs, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-07-13.
- How severe is CVE-2026-61503?
- Medium severity. CVSS v3 base score is 5.3 out of 10.