CVE-2026-39907

Unisys WebPerfect Image Suite 3.0 NTLMv2 Hash Leakage via WCF SOAP

Unisys WebPerfect Image Suite versions 3.0.3960.22810 and 3.0.3960.22604 expose an unauthenticated WCF SOAP endpoint on TCP port 1208 that accepts unsanitized file paths in the ReadLicense action's LFName parameter, allowing remote attackers to trigger SMB connections and leak NTLMv2 machine-account hashes. Attackers can submit crafted SOAP requests with UNC paths to force the server to initiate outbound SMB connections, exposing authentication credentials that may be relayed for privilege escalation or lateral movement within the network.

Affected

Unisys · WebPerfect Image Suite

CVSS v4.0 VULNCHECK

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 NVD

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

EPSS

0.99% chance of exploitation in the next 30 days, 62nd percentile

Published

2026-04-14

Updated

2026-05-08

Proof-of-concept exploits (1)

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

Security advisories

• https://www.vulncheck.com/advisories/unisys-webperfect-image-suite-ntlmv2-hash-leakage-vi…
• https://www.unisys.com/solutions/cai/applications

References

• CVE Record
• NVD entry