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XML 外部实体注入漏洞(XML External Entity Injection,简称 XXE),是一种容易被忽视,但危害巨大的漏洞。它可以利用 XML 外部实体加载注入,执行不可预控的代码,可导致读取任意文件、执行系统命令、探测内网端口、攻击内网网站等危害。