What’s Vulnerable › Vulnerabilities

CVE-2026-61503: Rejetto HFS < 3.2.1 Username Enumeration via Login Response Differences

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-13 · updated 2026-10-24
• Weakness: CWE-204

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

• rejetto hfs: from 3.0.0 before 3.2.1 — fixed in 3.2.1

How to fix

Upgrade to a fixed version: rejetto hfs 3.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/rejetto/hfs/releases/tag/v3.2.1
• https://www.vulncheck.com/advisories/rejetto-hfs-username-enumeration-via-login-response-differences

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