Server-Side Request Forgery (SSRF)
An issue was discovered in GitLab Community and Enterprise Edition 8.14 through 12.2.1. The Jira integration contains a SSRF vulnerability as a result of a bypass of the current protection mechanisms against this type of attack, which would allow sending requests to any resources accessible in the local network by the GitLab server.
CWE-918 - Server-Side Request Forgery (SSRF)
Server-side request forgery (SSRF) is a weakness that allows an attacker to send an arbitrary request, making it appear that the request was sent by the server. This request may bypass a firewall that would normally prevent direct access to the URL. The impact of this vulnerability can vary from unauthorized access to files and sensitive information to remote code execution.