LumisXP (aka Lumis Experience Platform) before 10.0.0 allows unauthenticated blind XML external entity (XXE) attacks via an API request to PageControllerXml.jsp. One can send a request crafted with an XXE payload and achieve outcomes such as reading local server files or denial of service.
View the template here CVE-2021-27931.yaml
References:
https://github.com/ARPSyndicate/cvemon