GitLab EE/CE 8.11 to 12.9 is leaking information on Issues opened in a public project and then moved to a private project through Web-UI and GraphQL API.
GitLab EE 3.0 through 12.8.1 allows SSRF. An internal investigation revealed that a particular deprecated service was creating a server side request forgery risk.
GitLab 10.1 through 12.8.1 has Incorrect Access Control. A scenario was discovered in which a GitLab account could be taken over through an expired link.