Server-Side Request Forgery (SSRF) in SaxEventRecorder by QOS.CH logback version 1.5.12 on the Java platform, allows an attacker to forge requests by compromising logback configuration files in XML.
The attacks involves the modification of DOCTYPE declaration in XML configuration files.
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.