The Slideshow WordPress plugin through 2.3.1 does not sanitize and escape some of its default slideshow settings, which could allow high-privileged users such as admin to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed
The SlideshowPluginSlideshowStylesheet::loadStylesheetByAJAX function in the Slideshow plugin 2.2.8 through 2.2.21 for Wordpress allows remote attackers to read arbitrary Wordpress option values.