An issue was discovered in GitLab Enterprise Edition (EE) 8.9.0 through 12.6.1. Using the project import feature, it was possible for someone to obtain issues from private projects.
In GitLab EE 11.3 through 12.5.3, 12.4.5, and 12.3.8, insufficient parameter sanitization for the Maven package registry could lead to privilege escalation and remote code execution vulnerabilities under certain conditions.
In GitLab EE 10.5 through 12.5.3, 12.4.5, and 12.3.8, when transferring a public project to a private group, private code would be disclosed via the Group Search API provided by the Elasticsearch integration.