CVE WatchJul 9, 2026

CVE-2026-54781

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 v

CVSS

7.4

High

EPSS

0.2%

KEV

—

Exploit Today

0-100

Published: Jul 8, 2026 · Last modified: Jul 9, 2026 · CWE-287 · CWE-345

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-07-092026-07-17

Technical 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.

Official references

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