CVE-2026-54784

HIGH7.4

CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality

Published Jul 8, 2026

Modified 1 months ago

Details

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.

References

WEB

https://github.com/CoreWCF/CoreWCF/commit/2afae08b2fa5288428df89e8161116b816cf6b4b

WEB

https://github.com/CoreWCF/CoreWCF/commit/f216aa6929d41dc99cee098b1e69c260ec4c41c7

WEB

https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1

WEB

https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-2288-8h3r-cqgg

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-54784

CVSS Analysis