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 WP-FaceThumb Cross-Site Scripting (1.0)
WordPress Plugin Bootstrap Shortcodes Cross-Site Scripting (3.4.0)
WordPress Plugin WP Smart Import: Import any XML File to WordPress Cross-Site Scripting (1.0.2)
WordPress Plugin Automatic Online Backup 'url' Parameter Cross-Site Scripting (0.8.2)