The vulnerability manifests in configuration panels where user-controlled parameters (like 'v[allow_animated_gifs]') are reflected in responses without proper HTML encoding. The PoC shows direct parameter reflection in /panel/configuration/pictures/ endpoint. In typical MVC CMS structures:- 1) Configuration controllers handle form submissions and rendering, making them likely candidates for missing output encoding- 2) The existence of similar vulnerabilities across multiple panels (pictures/mail/miscellaneous) suggests a pattern in configuration handling functions- 3) Menu add/edit functionality is another common XSS vector in CMS admin panels. While exact function names can't be verified without source code, these are logical locations based on the described attack vectors and CMS architecture patterns.