CVE-2026-39906

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.

CVSS v4.0

7.0 HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

10.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

0.69% chance of exploitation in the next 30 days, 50th percentile

Published

2026-04-14

Updated

2026-05-14

Proof-of-concept exploits (1)

• https://gist.github.com/VAMorales/be3e4ed472c51794493c1256cce16129

References

• CVE Record
• NVD entry

Related

• CVE-2026-39904
• CVE-2026-39907
• CVE-2026-3990
• CVE-2026-39908
• CVE-2026-39890
• CVE-2026-39912