Skip to content
CVE PROGRAM SOURCE RECORD7.4 High

CVE-2026-54784

CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

CoreWCF CoreWCF

  • >= 1.9.0, < 1.9.1affected

References