The vulnerability manifests through URL-based XSS payloads affecting documentation routes (/docs/master/...). This suggests:

1. Route handlers (like PublicController) process URL segments without validation
2. Blade templates output these parameters without HTML escaping (using {!! !!} instead of {{ }})
3. The specific reproduction path suggests documentation rendering components are vulnerable While exact code isn't available, Laravel CMS patterns and the attack vector indicate controller/view handling of URL parameters as the likely source.