Responsive Tabs < 4.0.7 - Contributor+ Stored XSS

Description The plugin does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks

PoC

1. Go to “Tab Sets > Add New” in WP Admin 2. Add a new tab and fill out values. 3. Intercept the request and for the tabs_color parameter, add the payload "+onmouseover='alert(1)'" 4. Send the request and then preview the tab group to see the XSS