GHSA-5MQ7-RWHJ-4FH9 Steeltoe: Header-forwarded client cert lacks proof of private-key possession

Summary When Steeltoe's certificate-based authorization UseCertificateAuthorization is configured, the default configuration of the middleware relies on the X-Client-Cert HTTP header to identify the client certificate, without verifying private-key possession. This header is not stripped by commo...