References https://github.com/Sec-Fork/POC-20250106/blob/main/%E7%94%A8%E5%8F%8BOA/%E7%94%A8%E5%8F%8BU8-Cloud%E7%B3%BB%E7%BB%9FXChangeServlet%E6%8E%A5%E5%8F%A3%E5%AD%98%E5%9C%A8XXE%E6%BC%8F%E6%B4%9E.md https://cn-sec.com/archives/2746969.html https://www.ddpoc.com/DVB-2024-6989.html https://github.com/Co5mos/nuclei-tps/blob/main/http/vulnerabilities/yonyou/yonyou-u8-cloud-xchangeservlet-xxe.yaml https://blog.csdn.net/qq_36618918/article/details/135402449 https://www.cnblogs.com/Domren/articles/19121519 https://github.com/izj007/wechat/blob/main/articles/%5B%E5%BC%A5%E5%A4%A9%E5%AE%89%E5%85%A8%E5%AE%9E%E9%AA%8C%E5%AE%A4%5D-2023-10-26-%E3%80%90%E6%88%90%E5%8A%9F%E5%A4%8D%E7%8E%B0%E3%80%91%E7%94%A8%E5%8F%8BU8-Cloud%20%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E6%BC%8F%E6%B4%9E.md https://www.cnblogs.com/pursue-security/p/17793738.html
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