JLSEC-2026-737 TLS 1.3 post-handshake authentication (PHA) issue where a server could accept a client's Finished...

TLS 1.3 post-handshake authentication PHA issue where a server could accept a client's Finished message without the client having sent a Certificate and CertificateVerify. The post-handshake-auth exemption that allows an empty/absent peer certificate was only intended for the initial handshake, b...