Which versions of Webperfect Image Suite are affected by CVE-2026-39907?

Unisys WebPerfect Image Suite versions 3.0.3960.22810 and 3.0.3960.22604 expose an unauthenticated network service on port 1208 that leaks machine-account NTLMv2 credentials, allowing attackers to…

How to fix or mitigate CVE-2026-39907?

Within 24 hours: Inventory all systems running Unisys WebPerfect Image Suite 3.0.3960.22810 or 3.0.3960.22604; restrict inbound access to TCP port 1208 via firewall rules to trusted networks only. Within 7 days: Isolate affected systems from the network or disable the WebPerfect service if operationally feasible; contact Unisys support to confirm patch availability timeline and request workaround options. Within 30 days: Apply vendor-released patch immediately upon release; if unavailable, implement network segmentation to prevent SMB traffic from affected systems to other assets, and deploy NTLM relay detection monitoring.

Webperfect Image Suite CVE-2026-39907

Q: What is the CVSS score of CVE-2026-39907?

CVE-2026-39907 has a CVSS 4.0 base score of 7.0 (High). CVSS 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/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. EPSS exploitation probability: 0.3%.

EUVD-2026-22726 HIGH

External Control of File Name or Path (CWE-73)

2026-04-14 disclosure@vulncheck.com

GHSA-8jpv-7gww-9r9j

Privilege Escalation Webperfect Image Suite

7.0

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

7.0 HIGH

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/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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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/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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Re-analysis Queued

Apr 17, 2026 - 15:52 vuln.today

cvss_changed

Analysis Generated

Apr 14, 2026 - 22:42 vuln.today

EUVD ID Assigned

Apr 14, 2026 - 22:22 euvd

EUVD-2026-22726

Analysis Generated

Apr 14, 2026 - 22:22 vuln.today

CVE Published

Apr 14, 2026 - 22:16 nvd

HIGH 7.0

DescriptionCVE.org

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.

AnalysisAI

Unisys WebPerfect Image Suite 3.0.3960.22810 and 3.0.3960.22604 leak NTLMv2 machine-account hashes through an unauthenticated SOAP endpoint on TCP port 1208, enabling remote attackers to force SMB authentication attempts and relay credentials for privilege escalation or lateral movement. The WCF service accepts unsanitized file paths in the ReadLicense action, allowing UNC path injection to trigger outbound SMB connections. CVSS 7.0 with network attack vector, low complexity, and no authentication required (PR:N). No public exploit code identified at time of analysis, though the attack technique is straightforward for adversaries familiar with NTLM relay tactics.

Technical ContextAI

The vulnerability resides in a Windows Communication Foundation (WCF) SOAP service exposing a ReadLicense action that processes file paths via the LFName parameter. The underlying flaw (CWE-73: External Control of File Name or Path) occurs when the application fails to sanitize user-supplied input before using it in file system operations. When an attacker provides a UNC path (e.g., \\attacker-server\share\file), Windows automatically initiates SMB authentication to the remote server, transmitting NTLMv2 hashes of the machine account running the service. This is a Server Message Block (SMB) coercion vulnerability pattern commonly exploited in Windows environments. The service listens on TCP 1208, providing a remotely accessible attack surface without authentication barriers. The CVSS 4.0 vector indicates low attack complexity (AC:L) and present attack requirements (AT:P), suggesting attackers need specific environmental conditions or timing but minimal technical sophistication once access to port 1208 is achieved.

RemediationAI

Contact Unisys support immediately to obtain patched versions of WebPerfect Image Suite addressing the unsanitized path handling in the WCF SOAP endpoint. No vendor-released patch version independently confirmed from available data at time of analysis-consult Unisys advisories or support channels referenced at https://www.unisys.com/solutions/cai/applications/ for update availability. As immediate mitigation, restrict network access to TCP port 1208 using firewall rules to permit only trusted management systems or disable the WCF service if not operationally required. Implement SMB signing enforcement (required, not just enabled) across the Windows environment to prevent NTLM relay attacks even if hashes are leaked. Deploy Extended Protection for Authentication (EPA) on SMB services to bind authentication to TLS channels. Monitor outbound SMB connections from WebPerfect Image Suite servers to detect exploitation attempts. Consider network segmentation to isolate document management systems from high-value targets accessible via relayed credentials. Apply principle of least privilege to service accounts running the WCF endpoint to limit lateral movement impact.