Login Rebuilder < 2.8.1 - Admin+ Stored XSS

The plugin does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

PoC

1. Go to Settings » Login rebuilder 2. In Login file keyword, add payload: "> 3. Save the changes to trigger XSS.