Vulnerability in Unisys Webperfect Image Suite
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (57.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.009 · change: +0.002
Affected products
- Unisys Webperfect Image Suite — versions 3.0.3960.22810, 3.0.3960.22604
- Unisys Webperfect Image Suite — versions 3.0.3960.22604, 3.0.3960.22810
Weakness classification (CWE)
References
- gist.github.com/VAMorales/be3e4ed472c51794493c1256cce16129 (Exploit, technical-description, Third Party Advisory, exploit)
- www.unisys.com/solutions/cai/applications/ (Product, product)
- www.vulncheck.com/advisories/unisys-webperfect-image-suite-ntlmv2-hash-leakage-… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-39906?
- CVE-2026-39906 is a critical-severity vulnerability in Unisys Webperfect Image Suite, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 10.0/10. Published 2026-04-14.
- How severe is CVE-2026-39906?
- Critical severity. CVSS v3 base score is 10.0 out of 10.