An issue has been discovered in GitLab CE/EE affecting all versions from 16.9 before 17.4.6, 17.5 before 17.5.4, and 17.6 before 17.6.2. By using a specific GraphQL query, under specific conditions an unauthorized user can retrieve branch names.
{ "binaries": [ { "binary_version": "8.5.8+dfsg-5", "binary_name": "gitlab" } ] }