CVE-2026-54782— CoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation
Possible ATT&CK Techniques 1AI
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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
II. Public POCs for CVE-2026-54782
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 10803 chars
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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
- CVE-2026-54781
CoreWCF: SAML SubjectConfirmation methods and holder-of-key - CVE-2026-54784
CoreWCF: SPNEGO SecurityContextToken proof key wrapped witho - CVE-2026-54774
CoreWCF: SamlSerializer skips SignatureValue verification wh - CVE-2026-54783
CoreWCF: XML Signature Wrapping in WS-Security endorsing/sup - CVE-2026-54780
CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite
Same vendor: CoreWCF
- CVE-2026-54781
CoreWCF: SAML SubjectConfirmation methods and holder-of-key - CVE-2026-54784
CoreWCF: SPNEGO SecurityContextToken proof key wrapped witho - CVE-2026-54774
CoreWCF: SamlSerializer skips SignatureValue verification wh - CVE-2026-54783
CoreWCF: XML Signature Wrapping in WS-Security endorsing/sup - CVE-2026-54780
CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite
Same weakness: CWE-290
- CVE-2026-72816
go-chi chi before 5.3.0 IP Spoofing via RealIP Middleware - CVE-2026-72815
go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header - CVE-2026-6387
Lenovo system update 授权问题漏洞 - CVE-2026-53791
rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header - CVE-2026-19291
Bluetooth re-pairing can use a lower security level than pre
V. Comments for CVE-2026-54782
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