Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Kharim Tomlinson WP Next Post Navi allows Stored XSS.This issue affects WP Next Post Navi: from n/a through 1.8.3.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.