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OpenAdvisories
High · 7.4 CVE-2026-54784 EUVD-2026-42471GHSA-2288-8h3r-cqgg

CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality

Published Jul 8, 2026 · Updated Jul 10, 2026 · Assigned by GitHub_M

Description

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. In version 1.9.0, CoreWCF SPNEGO SecurityContextToken negotiation can expose the proof key recovered from the RSTR when TransportWithMessageCredential with Windows client credentials and session establishment are used, allowing an observer to impersonate the authenticated Windows principal and decrypt or forge WS-SecureConversation traffic. This issue is fixed in version 1.9.1.

Affected products

VendorProductAffectedFixed
CoreWCF CoreWCF >= 1.9.0, < 1.9.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
NuGet CoreWCF.Primitives >= 1.9.0, < 1.9.1 1.9.1 GHSA-2288-8h3r-cqgg

References