The icon-uri servlet allows arbitrary HTTP requests to be proxied - CVE-2017-9506

The IconUriServlet of the Atlassian OAuth Plugin from version 1.3.0 before version 1.9.12 and from version 2.0.0 before version 2.0.4 allows remote attackers to access the content of internal network resources and/or perform an XSS attack via Server Side Request Forgery (SSRF). When running in an environment like Amazon EC2, this flaw can used to access to a metadata resource that provides access credentials and other potentially confidential information.