How severe is CVE-2026-61503?

CVE-2026-61503 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-61503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-61503?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-61503 published?

CVE-2026-61503 was published on 2026-07-13 and last updated on 2026-07-15.

CVE-2026-61503

CVE-2026-61503 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-204.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-204
Published: 2026-07-13
Last modified: 2026-07-15

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-61503?: CVE-2026-61503 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-61503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-61503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-61503 published?: CVE-2026-61503 was published on 2026-07-13 and last updated on 2026-07-15.

References

Other CWE-204 vulnerabilities

CVE-2018-25350 — Critical (CVSS 9.8): userSpice 4.3.24 contains a username enumeration vulnerability that allows unauthenticated attackers to discover valid…
CVE-2026-15747 — Critical (CVSS 9.1): Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a…
CVE-2026-69519 — High (CVSS 8.6): Observable response discrepancy in Azure Stack HCI allows an unauthorized attacker to disclose information over a…
CVE-2025-5485 — High (CVSS 8.6): User names used to access the web management interface are limited to the device identifier, which is a numerical…
CVE-2026-27462 — High (CVSS 7.5): Combodo iTop is a web based IT service management tool. Prior to 3.2.3, iTop returns different responses for…
CVE-2026-33419 — High (CVSS 7.5): MinIO is a high-performance object storage system. Prior to RELEASE.2026-03-17T21-25-16Z, MinIO AIStor's STS (Security…

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