An issue was discovered in GitLab Enterprise Edition before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1. The Jira integration feature is vulnerable to an unauthenticated blind SSRF issue.
https://about.gitlab.com/2019/01/31/security-release-gitlab-11-dot-7-dot-3-released/