CVE-2021-44791: Apache Druid before 0.23.0 vulnerable to reflected XSS via unescaped URL parameters

The provided vulnerability information describes a reflected XSS issue caused by unescaped URL parameters in HTML responses. However, the GitHub patch information and commit diffs are explicitly marked as unavailable, and the public descriptions do not contain specific code references or file paths. While the vulnerability pattern suggests improper output encoding in web request handlers, there is insufficient technical detail to identify exact function names, file paths, or implementation contexts with high confidence. The vulnerability could theoretically exist in multiple parameter handling locations, but without concrete code examples or patch comparisons, specific vulnerable functions cannot be reliably determined.