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

Quick assessment

Affected
CoreWCF CoreWCF
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CoreWCF是CoreWCF团队开源的一个开源项目,旨在为 .NET Core 和 .NET 5+ 提供 WCF(Windows Communication Foundation)的替代实现。 CoreWCF存在加密问题漏洞，该漏洞源于SPNEGO SecurityContextToken协商在使用TransportWithMessageCredential与Windows客户端凭据和会话建立时可能暴露从RSTR恢复的证明密钥，允许观察者冒充经过身份验证的Windows主体并解密或伪造WS-Secure

CVSS 7.4 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1552.005 · Cloud Instance Metadata API

Affected Version Matrix 1

VendorProduct Version RangeStatus
CoreWCF CoreWCF >= 1.9.0, < 1.9.1 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据加密缺失
Source: CVE Program / CVE List V5
Vulnerability Title
CoreWCF 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CoreWCF是CoreWCF团队开源的一个开源项目,旨在为 .NET Core 和 .NET 5+ 提供 WCF(Windows Communication Foundation)的替代实现。 CoreWCF存在加密问题漏洞，该漏洞源于SPNEGO SecurityContextToken协商在使用TransportWithMessageCredential与Windows客户端凭据和会话建立时可能暴露从RSTR恢复的证明密钥，允许观察者冒充经过身份验证的Windows主体并解密或伪造WS-Secure
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
CoreWCF CoreWCF >= 1.9.0, < 1.9.1 -

II. Public POCs for CVE-2026-54784

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8021 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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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-2026-54782 10.0 CRITICAL CoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation
CVE-2026-54772 7.5 HIGH CoreWCF: Pre-authentication infinite-loop CPU exhaustion in CoreWCF net.tcp / net.pipe / n
CVE-2026-54783 7.4 HIGH CoreWCF: XML Signature Wrapping in WS-Security endorsing/supporting signature verification
CVE-2026-54774 7.4 HIGH CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not a
CVE-2026-54781 7.4 HIGH CoreWCF: SAML SubjectConfirmation methods and holder-of-key proof keys are not enforced
CVE-2026-54775 6.5 MEDIUM CoreWCF: Kafka consume pump halts permanently on a Kafka tombstone (null-value record), ca
CVE-2026-54777 6.5 MEDIUM CoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance
CVE-2026-54778 6.2 MEDIUM CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution
CVE-2026-54779 5.9 MEDIUM CoreWCF: SAML token replay protection is inoperative
CVE-2026-54773 5.9 MEDIUM CoreWCF: WS-Security signature substitution via document-wide Signature lookup
CVE-2026-54776 4.4 MEDIUM CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the secu
CVE-2026-54780 3.7 LOW CoreWCF: 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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