CVE WatchJul 10, 2026

CVE-2026-54784

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. In version 1.9.0, CoreWCF SPNEGO SecurityConte

CVSS

7.4

High

EPSS

0.3%

p19

KEV

—

Exploit Today

0-100

Published: Jul 8, 2026 · Last modified: Jul 10, 2026 · CWE-311 · CWE-523

EPSS · 30d

0.2%EPSS · 30 days0.3%

2026-08-062026-09-02

Technical 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.

Official references

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