CVE-2026-54782

CRITICAL10.0

CoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation

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, 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.

References

WEB

https://github.com/CoreWCF/CoreWCF/commit/0b8c8af851260e85e8402af53233d1b8f87dfb6f

WEB

https://github.com/CoreWCF/CoreWCF/commit/0e63c2cca55763d8be6b226a234579280a09e7b6

WEB

https://github.com/CoreWCF/CoreWCF/commit/e5cc9b6a4ecc102a50d782093bfc72e0790abe3d

WEB

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

WEB

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

WEB