SPH Engineering UgCS up to 6.1 Login LoginHandler userLogin/userPassword improper authentication

Summaryinfo

A vulnerability described as critical has been identified in SPH Engineering UgCS up to 6.1. The impacted element is the function LoginHandler of the component Login Handler. Such manipulation of the argument userLogin/userPassword leads to improper authentication. This vulnerability is traded as CVE-2026-59104. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in SPH Engineering UgCS up to 6.1. Affected by this issue is the function LoginHandler of the component Login Handler. The manipulation of the argument userLogin/userPassword with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. CVE summarizes:

UgCS server before 6.2 contains an authentication bypass in the HCI protocol login handler (LoginHandler) exposed on TCP port 3334. When the user database contains exactly one user (the default single-operator installation), a LoginRequest with empty userLogin and userPassword fields is interpreted as \"use the only user\" rather than as invalid credentials, and the server returns a fully authenticated session. Because the service listens on all interfaces (0.0.0.0) without TLS by default, an unauthenticated remote attacker with network access to port 3334 can obtain an authenticated session without knowing any credential and then issue privileged commands, including commanding connected drones and uploading flight routes.

This vulnerability is handled as CVE-2026-59104 since 07/02/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

Upgrading to version 6.2 eliminates this vulnerability.

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Productinfo

Vendor

• SPH Engineering

Name

• UgCS

Version

• 6.0
• 6.1

CPE 2.3info

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CPE 2.2info

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• 🔒

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