SKILL: Expression Language Injection — Expert Attack Playbook AI LOAD INSTRUCTION : Expert EL injection techniques covering SpEL (Spring), OGNL (Struts2), and Java EL (JSP/JSF). Distinct from SSTI — EL injection targets expression evaluators in Java frameworks, not template engines. Covers sandbox bypass, manipulation, actuator abuse, and real-world CVE chains. 0. RELATED ROUTING - ssti-server-side-template-injection for template engines (Jinja2, FreeMarker, Twig) — different attack surface - jndi-injection when EL evaluation leads to JNDI lookup Key distinction : SSTI targets template render…