Security Advisory

CVE-2026-54781

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-08 22:19:40

Last updated 2026-07-09 14:40:11

Assigner GitHub_M

CVSS score 7.4

State PUBLISHED

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.

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