WordPress: "Bad Protocols Validation" Bypass in "wp_kses_bad_protocol_once" using HTML-encoding without trailing semicolons

Description: The wpksesbadprotocolonce function https://developer.wordpress.org/reference/functions/wpksesbadprotocolonce/ is used to sanitise content from bad protocols and other characters. It detects the protocol URI scheme by using the first colon character. It compares the identified protoco...