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expression-language-injection

yaklang/hack-skills

Expression Language injection playbook. Use when Java EL, SpEL, OGNL, or MVEL expressions may evaluate attacker-controlled input in Spring, Struts2, Confluence, or similar frameworks.

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安装命令

npx skills add https://github.com/yaklang/hack-skills --skill expression-language-injection

SKILL.md

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, _memberAccess manipulation, actuator abuse, and real-world CVE chains.

0. RELATED ROUTING

Key distinction: SSTI targets template rendering engines; EL injection targets expression evaluators embedded in Java frameworks. They share detection probes (${7*7}) but diverge in exploitation.

1. DETECTION — POLYGLOT PROBES

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