CVE-2026-54784 (GCVE-0-2026-54784)
Vulnerability from cvelistv5 – Published: 2026-07-08 22:18 – Updated: 2026-07-10 03:55
VLAI
EPSS
VEX
Title
CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality
Summary
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.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 00:00 UTC
Assigner
GitHub_M
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/CoreWCF/CoreWCF/security/advis… | x_refsource_CONFIRM |
| https://github.com/CoreWCF/CoreWCF/commit/2afae08… | x_refsource_MISC |
| https://github.com/CoreWCF/CoreWCF/commit/f216aa6… | x_refsource_MISC |
| https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1 | x_refsource_MISC |
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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