CVE-2026-54774 — CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate
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 wh…
Published: 2026-07-08 · CVSS: 7.4 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7