CVE-2026-39906Public exploitNetwork attack vector

NTLMv2 hash disclosure via UNC path unmarshalling

Published Apr 14, 2026 · Updated Apr 14, 2026

NTLMv2 hash disclosure in Unisys WebPerfect Image Suite allows remote attackers to leak service hashes via a .NET Remoting request. The Unisys.SOA.PerfectImageService.exe endpoint unmarshals a crafted call to Interfaces.rem and processes an attacker-controlled UNC path through System.Media.SoundPlayer, forcing the service account to authenticate over SMB. No credentials or user interaction are required on 3.0.3960.22604 and 3.0.3960.22810; the captured machine-account hash enables relay only when network configuration and target protections permit.

CVSS severity7.0
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NTLMv2 hash disclosure in Unisys WebPerfect Image Suite allows remote attackers to leak service hashes via a .NET Remoting request. The Unisys.SOA.PerfectImageService.exe endpoint unmarshals a crafted call to Interfaces.rem and processes an attacker-controlled UNC path through System.Media.SoundPlayer, forcing the service account to authenticate over SMB. No credentials or user interaction are required on 3.0.3960.22604 and 3.0.3960.22810; the captured machine-account hash enables relay only when network configuration and target protections permit.

The record

CVE
CVE-2026-39906
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
Unisys
Product
WebPerfect Image Suite
Classifications
CWE-441, T1187
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.3960.22604
  2. Affected versionversion=3.0.3960.22810

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Unisys · WebPerfect Image Suiteversion=3.0.3960.22604; version=3.0.3960.22810

Published CVSS scores

7.0VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N
10.0NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-441Unintended Proxy or Intermediary ('Confused Deputy')
T1187Forced Authentication

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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