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CVE-2026-54782— CoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation

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存在安全漏洞，该漏洞源于SAML令牌验证未正确解析颁发者签名密钥或要求签名令牌，允许未经身份验证的远程攻击者冒充可信STS颁发的任何主体。

CVSS 10.0 · Critical EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 2

VendorProduct Version RangeStatus
CoreWCF CoreWCF >= 1.9.0, < 1.9.1 affected
< 1.8.1 affected
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I. Basic Information for CVE-2026-54782

Vulnerability Information
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Vulnerability Title
CoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation
Source: CVE Program / CVE List V5
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 1.1 and SAML 2.0 token validation does not correctly resolve the issuer signing key or require signed tokens when IdentityConfiguration is used with federated bindings, allowing an unauthenticated remote attacker to impersonate any principal the trusted STS could issue. This issue is fixed in versions 1.8.1 and 1.9.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
CoreWCF 授权问题漏洞
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存在安全漏洞，该漏洞源于SAML令牌验证未正确解析颁发者签名密钥或要求签名令牌，允许未经身份验证的远程攻击者冒充可信STS颁发的任何主体。
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-2026-54782

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10803 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-2026-54782

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Patches & Fixes for CVE-2026-54782 (3)

Vendor Advisories for CVE-2026-54782 (1)

Vendor Pages for CVE-2026-54782 (1)

Other References for CVE-2026-54782 (1)

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

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-2026-54784 7.4 HIGH CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality
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-290

V. Comments for CVE-2026-54782

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