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CVE-2026-54784— CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality

CVSS 7.4 · High

Possible ATT&CK Techniques 1AI

T1552.005 · Cloud Instance Metadata API
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I. Basic Information for CVE-2026-54784

Vulnerability Information
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Vulnerability Title
CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
敏感数据加密缺失
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
CoreWCFCoreWCF >= 1.9.0, < 1.9.1 -

II. Public POCs for CVE-2026-54784

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 8021 chars
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III. Intelligence Information for CVE-2026-54784

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Patches & Fixes for CVE-2026-54784 (2)

Vendor Advisories for CVE-2026-54784 (1)

Vendor Pages for CVE-2026-54784 (1)

Same Patch Batch · CoreWCF · 2026-07-08 · 13 CVEs total

CVE-2026-5478210.0 CRITICALCoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation
CVE-2026-547727.5 HIGHCoreWCF: Pre-authentication infinite-loop CPU exhaustion in CoreWCF net.tcp / net.pipe / n
CVE-2026-547837.4 HIGHCoreWCF: XML Signature Wrapping in WS-Security endorsing/supporting signature verification
CVE-2026-547747.4 HIGHCoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not a
CVE-2026-547817.4 HIGHCoreWCF: SAML SubjectConfirmation methods and holder-of-key proof keys are not enforced
CVE-2026-547756.5 MEDIUMCoreWCF: Kafka consume pump halts permanently on a Kafka tombstone (null-value record), ca
CVE-2026-547776.5 MEDIUMCoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance
CVE-2026-547786.2 MEDIUMCoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution
CVE-2026-547795.9 MEDIUMCoreWCF: SAML token replay protection is inoperative
CVE-2026-547735.9 MEDIUMCoreWCF: WS-Security signature substitution via document-wide Signature lookup
CVE-2026-547764.4 MEDIUMCoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the secu
CVE-2026-547803.7 LOWCoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass

IV. Related Vulnerabilities

Same product: CoreWCF
Same vendor: CoreWCF
Same weakness: CWE-311

V. Comments for CVE-2026-54784

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