bypassing permission error for a plugin’s page

While there can be checks inside page the page itself is added via API call, like add_options_page() (there are several analogous functions that add pages to different parts of admin).

This call includes capability argument. In your case either the extension in question is poorly coded and does something strange around there or your user is somehow corrupted (unlikely if you are not seeing similar errors all over admin).

error code: 523