Unisys WebPerfect Image Suite 3.0.3960.22604/3.0.3960.22810 Network Configuration target file confused deputy

Summaryinfo

A vulnerability described as critical has been identified in Unisys WebPerfect Image Suite 3.0.3960.22604/3.0.3960.22810. Affected by this issue is some unknown functionality of the component Network Configuration Handler. The manipulation of the argument target file results in confused deputy. This vulnerability is known as CVE-2026-39906. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Unisys WebPerfect Image Suite 3.0.3960.22604/3.0.3960.22810. Affected is an unknown code block of the component Network Configuration Handler. The manipulation of the argument target file with an unknown input leads to a confused deputy vulnerability. CWE is classifying the issue as CWE-441. The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. This causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Unisys WebPerfect Image Suite versions 3.0.3960.22810 and 3.0.3960.22604 expose a deprecated .NET Remoting TCP channel that allows remote unauthenticated attackers to leak NTLMv2 machine-account hashes by supplying a Windows UNC path as a target file argument through object-unmarshalling techniques. Attackers can capture the leaked NTLMv2 hash and relay it to other hosts to achieve privilege escalation or lateral movement depending on network configuration and patch level.

The weakness was published by Victor A. Morales. The advisory is shared for download at unisys.com. This vulnerability is traded as CVE-2026-39906 since 04/07/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/15/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-22724). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Unisys

Name

• WebPerfect Image Suite

Version

• 3.0.3960.22604
• 3.0.3960.22810

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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