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.

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…

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.

Affected products

Rejetto Hfs — versions 3.0.0

Weakness classification (CWE)

CWE-204 — Observable Response Discrepancy

References

disclosure@vulncheck.com (release-notes, patch)
disclosure@vulncheck.com (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.