How severe is CVE-2026-39907?

CVE-2026-39907 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-39907 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39907?

CVE-2026-39907 primarily affects Unisys Webperfect Image Suite. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-39907?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-39907 have an EU (EUVD) identifier?

Yes. CVE-2026-39907 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22726.

When was CVE-2026-39907 published?

CVE-2026-39907 was published on 2026-04-14 and last updated on 2026-07-24.

CVE-2026-39907

CVE-2026-39907 is a critical-severity vulnerability in Unisys Webperfect Image Suite with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-73.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v4: 7.0
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-22726
Weakness: CWE-73
Affected product: Unisys Webperfect Image Suite
Published: 2026-04-14
Last modified: 2026-07-24

Description

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.

Frequently asked questions

What is CVE-2026-39907?: 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.
How severe is CVE-2026-39907?: CVE-2026-39907 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-39907 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39907?: CVE-2026-39907 primarily affects Unisys Webperfect Image Suite. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-39907?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-39907 have an EU (EUVD) identifier?: Yes. CVE-2026-39907 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22726.
When was CVE-2026-39907 published?: CVE-2026-39907 was published on 2026-04-14 and last updated on 2026-07-24.

References

Affected products (2)

cpe:2.3:a:unisys:webperfect_image_suite:3.0.3960.22604:*:*:*:*:*:*:*
cpe:2.3:a:unisys:webperfect_image_suite:3.0.3960.22810:*:*:*:*:*:*:*

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