XSS without parentheses bypass technique allows an attacker to define variables within the JavaScript context, such as event handlers or the javascript: scheme, to bypass a Web Application Firewall (WAF). By strategically placing the closing parenthesis ")" before the opening parenthesis "(", the attacker can evade WAF filtering mechanisms. Security researchers @garethheyes and @PortSwigger shared this insightful #bugbountytip on XSS bypass. Blogpost: [Link to Blog Post]
Check out the original tweet here: https://twitter.com/Sharo_k_h/status/1816015460636242373