CVE-2026-54774

HIGH7.4

CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate

Published Jul 8, 2026

Modified 2 weeks ago

Details

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.

References

WEB

https://github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8

WEB

https://github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4

WEB

https://github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979b

WEB

https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1

WEB

https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1

WEB