CVE-2026-39906

Critical

Published: 14/04/2026(UTC)Translated: 14/06/2026(UTC)NVD NIST

Summary

Versions 3.0.3960.22810 and 3.0.3960.22604 of Unisys WebPerfect Image Suite expose a deprecated .NET Remoting TCP channel, allowing remote unauthenticated attackers to leak NTLMv2 machine-account hashes. Attackers can use object-unmarshalling techniques to supply a UNC path as a target file argument.

Risk Assessment

Organizations may be at risk of privilege escalation or lateral movement within the network if attackers capture leaked NTLMv2 hashes and use them to attack other hosts.

Recommendation

It is recommended to update to the latest version of Unisys WebPerfect Image Suite and to block access to deprecated .NET Remoting TCP channels to minimize the risk of data leakage.

Original NVD description (English source)

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.