Cross-site scripting(XSS) is a type of computer security vulnerability tipically found in Web application. XSS enables attackers to inject client-side scripts into Web pages viewed by other users. HTML tag '<object>' is used to add an object to HTML code. Many attributes of '<object>' can be used to implement XSS attack, such as 'type', 'data'. This rule detects '<object' in HTTP request. This rule supports to defend the A3: Injection of OWASP Top 10 - 2021. Other reference:None