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CVE-2026-54779— CoreWCF: SAML token replay protection is inoperative

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-54779

Vulnerability Information
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Vulnerability Title
CoreWCF: SAML token replay protection is inoperative
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 replay protection is inoperative because DefaultTokenReplayCache.TryAdd does not reject duplicate tokens when DetectReplayedTokens is enabled, allowing a captured token to be reused. 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:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
CoreWCFCoreWCF >= 1.9.0, < 1.9.1 -

II. Public POCs for CVE-2026-54779

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III. Intelligence Information for CVE-2026-54779

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Patches & Fixes for CVE-2026-54779 (3)

Vendor Advisories for CVE-2026-54779 (1)

Vendor Pages for CVE-2026-54779 (1)

Other References for CVE-2026-54779 (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-2026-547847.4 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-2026-547735.9 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-294

V. Comments for CVE-2026-54779

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