Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The Apache DeltaSpike-JSF up to 1.8.0 module has a XSS injection leak in the windowId handling. The default size of the windowId get's cut off after 10 characters (by default), so the impact might be limited. A fix got applied and released in Apache deltaspike-1.8.1.
CWE-79 - Cross Site Scripting
Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.