The Cost Calculator WordPress plugin through 1.8 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.

The Cost Calculator WordPress plugin before 1.6 allows users with a role as low as Contributor to perform Stored Cross-Site Scripting attacks via the Description fields of a Cost Calculator > Price Settings (which gets injected on the edit page as well as any page that embeds the calculator using the shortcode), as well as the Text Preview field of a Project (injected on the edit project page)

The Cost Calculator WordPress plugin through 1.6 allows authenticated users (Contributor+ in versions < 1.5, and Admin+ in versions <= 1.6) to perform path traversal and local PHP file inclusion on Windows Web Servers via the Cost Calculator post's Layout