A Server-Side Request Forgery (SSRF) in the Plugins Page of WonderCMS v3.4.3 allows attackers to force the application to make arbitrary requests via injection of crafted URLs into the pluginThemeUrl 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.
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.