CVE-2026-63490 Handlebars.java: Arbitrary file read in `SpringTemplateLoader` via URL-fragment suffix bypass

Handlebars.java provides logic-less and semantic Mustache templates with Java. Prior to 4.5.3, com.github.jknack.handlebars.springmvc.SpringTemplateLoader resolves attacker-influenced Spring MVC view names through Spring ResourceLoader without the path-containment validation used by other URL-bas...