Description
Cross-site Scripting (XSS) refers to client-side code injection attack wherein an attacker can execute malicious scripts into a legitimate website or web application. XSS occurs when a web application makes use of unvalidated or unencoded user input within the output it generates.
Remediation
Apply context-dependent encoding and/or validation to user input rendered on a page
References
Cross-site Scripting (XSS) Attack - Acunetix
XSS Filter Evasion Cheat Sheet
Excess XSS, a comprehensive tutorial on cross-site scripting
Related Vulnerabilities
WordPress Plugin Trashbin 'mtb_undelete' Parameter Cross-Site Scripting (0.1)
WordPress Plugin Modula Image Gallery Cross-Site Scripting (1.3.5)
WordPress Plugin Images Lazyload and Slideshow Cross-Site Scripting (3.2)
WordPress Plugin Dynamic Widgets 'id' Parameter Cross-Site Scripting (1.5.1)
WordPress Plugin WP Mobile Menu-The Mobile-Friendly Responsive Menu Cross-Site Scripting (2.8.2.2)