CVE-2026-54784 | THREATINT

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.

PUBLISHED Reserved 2026-06-15 | Published 2026-07-08 | Updated 2026-07-10 | Assigner GitHub_M

HIGH: 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem types

CWE-311: Missing Encryption of Sensitive Data

CWE-523: Unprotected Transport of Credentials

Product status

>= 1.9.0, < 1.9.1

affected

References

github.com/...oreWCF/security/advisories/GHSA-2288-8h3r-cqgg

github.com/...ommit/2afae08b2fa5288428df89e8161116b816cf6b4b

github.com/...ommit/f216aa6929d41dc99cee098b1e69c260ec4c41c7

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

cve.org (CVE-2026-54784)

nvd.nist.gov (CVE-2026-54784)

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