Themify Portfolio Post < 1.2.1 - Contributor+ Stored XSS

The plugin does not validate and escapes some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as a contributor to perform Stored Cross-Site Scripting attacks, which could be used against high privileged users such as admin.

Exploit shortcode: 

[themify_portfolio_posts style='grid1" onmouseover="alert(1)" style="width:100px;height:100px;background:red;']