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Description

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.

PUBLISHED Reserved 2026-04-07 | Published 2026-04-14 | Updated 2026-05-14 | Assigner VulnCheck




HIGH: 7.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N

Problem types

Unintended Proxy or Intermediary ('Confused Deputy')

Product status

Default status
unknown

3.0.3960.22810 (custom)
affected

3.0.3960.22604 (custom)
affected

Timeline

2025-12-15:VulnCheck, as the third-party coordinator and intermediary, initiated outreach to Unisys and other potentially-related entities.

Credits

Victor A. Morales, Senior Pentester Team Leader, GM Sectec, Corp. finder

VulnCheck coordinator

References

gist.github.com/VAMorales/be3e4ed472c51794493c1256cce16129 technical-description exploit

www.unisys.com/solutions/cai/applications/ product

www.vulncheck.com/...te-ntlmv2-hash-leakage-via-net-remoting third-party-advisory

cve.org (CVE-2026-39906)

nvd.nist.gov (CVE-2026-39906)

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