Is CVE-2026-54781 actively exploited?

No active exploitation of CVE-2026-54781 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-54781 be exploited remotely?

Yes. CVE-2026-54781 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-54781?

CVE-2026-54781 has a CVSS score of 7.4 (HIGH).

HOME VULNERABILITIESCVE-2026-54781

HIGH

CVE-2026-54781

CWE-287Published: July 8, 2026· Updated: Jul 9, 2026

7.4

CVSS v3.1

EPSS:0.18%probability of exploitation in 30 daysPercentile:7.5th

Official Description

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, CoreWCF SAML token validation does not enforce SubjectConfirmation method URIs or holder-of-key proof keys in SamlSecurityTokenHandler, allowing holder-of-key downgrade or custom confirmation method assertions to authenticate a subject without proving authority over the assertion. This issue is fixed in versions 1.8.1 and 1.9.1.

NVD Source

Technical Analysis

CVE-2026-54781 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 7.4.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.