CVE-2026-54774: CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate

June 19, 2026

When a service is configured to validate SAML tokens using a method other than X.509 certificate signing, the final signature verification is skipped.

References

github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9
github.com/advisories/GHSA-rpj7-hr7h-w6p9
nvd.nist.gov/vuln/detail/CVE-2026-54774

Code Behaviors & Features

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