A Server-Side Request Forgery (SSRF) in the installUpdateThemePluginAction function of WonderCMS v3.1.3 allows attackers to force the application to make arbitrary requests via injection of crafted URLs into the installThemePlugin parameter.
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.