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 WooCommerce Predictive Search Cross-Site Scripting (1.0.5)
WordPress Plugin Upload File Type Settings Cross-Site Scripting (1.1)
WordPress Plugin Wonder Video Embed Cross-Site Scripting (1.7)
ColdFusion User-Agent cross-site scripting
WordPress Plugin Background Music Cross-Site Scripting (1.0)