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CVE-2026-54781— CoreWCF: SAML SubjectConfirmation methods and holder-of-key proof keys are not enforced

CVSS 7.4 · High

Possible ATT&CK Techniques 1AI

T1550.004 · Web Session Cookie
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I. Basic Information for CVE-2026-54781

Vulnerability Information
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Vulnerability Title
CoreWCF: SAML SubjectConfirmation methods and holder-of-key proof keys are not enforced
Source: NVD (National Vulnerability Database)
Vulnerability Description
CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, CoreWCF SAML token validation does not enforce SubjectConfirmation method URIs or holder-of-key proof keys in SamlSecurityTokenHandler, allowing holder-of-key downgrade or custom confirmation method assertions to authenticate a subject without proving authority over the assertion. This issue is fixed in versions 1.8.1 and 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
认证机制不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
CoreWCFCoreWCF >= 1.9.0, < 1.9.1 -

II. Public POCs for CVE-2026-54781

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 11330 chars
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III. Intelligence Information for CVE-2026-54781

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Patches & Fixes for CVE-2026-54781 (3)

Vendor Advisories for CVE-2026-54781 (1)

Vendor Pages for CVE-2026-54781 (1)

Other References for CVE-2026-54781 (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-2026-547847.4 HIGHCoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality
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-287

V. Comments for CVE-2026-54781

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