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, SamlSerializer skips final SignatureValue verification when a CoreWCF service validates SAML tokens using a non-X.509 signing token, allowing an attacker to reference a non-X.509 SecurityToken key identifier and bypass assertion signature verification. This issue is fixed in versions 1.8.1 and 1.9.1.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00
- https://github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081
- https://github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb5497
- https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1
- https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1
- https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9
FAQ
What is CVE-2026-54774?
CVE-2026-54774 is a vulnerability with a CVSS score of 7.4 (HIGH). 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, SamlSerializer skips final SignatureValue verification when a CoreWCF service va...
How severe is CVE-2026-54774?
CVE-2026-54774 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54774?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.