CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality

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Summary

CVECVE-2026-54784
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 23:16:56 UTC
Updated2026-07-08 23:16:56 UTC
DescriptionCoreWCF 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

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

Problem Types: CWE-311 | CWE-523 | CWE-311 CWE-311: Missing Encryption of Sensitive Data | CWE-523 CWE-523: Unprotected Transport of Credentials

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA CoreWCF CoreWCF affected >= 1.9.0, < 1.9.1 Not specified

References

ReferenceSourceLinkTags
github.com/CoreWCF/CoreWCF/commit/f216aa6929d41dc99cee098b1e69c260ec4c41c7 [email protected] github.com
github.com/CoreWCF/CoreWCF/security/advisories/GHSA-2288-8h3r-cqgg [email protected] github.com
github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1 [email protected] github.com
github.com/CoreWCF/CoreWCF/commit/2afae08b2fa5288428df89e8161116b816cf6b4b [email protected] github.com
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