The Meteor Slides plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'slide_url_value' parameter in all versions up to, and including, 1.5.7 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Josh Leuze Meteor Slides meteor-slides allows Stored XSS.This issue affects Meteor Slides: from n/a through <= 1.5.7.
The Meteor Slides WordPress plugin before 1.5.7 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.