Show-Hide / Collapse-Expand < 1.3.0 - Contributor+ Stored XSS via Shortcode

The Show-Hide / Collapse-Expand WordPress plugin before 1.3.0 does not validate and escape some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attacks which could be used against high privilege users such as admins.