CVE-2026-76986 Apache Wicket: XSS in AbstractSingleSelectChoice via getNullValidDisplayValue

Improper neutralization of input during web page generation in Apache Wicket. org.apache.wicket.markup.html.form.AbstractSingleSelectChoice, the base class of DropDownChoice, writes the body of the default option — the entry shown when no choice is selected — into the markup as it is, while every...