A vulnerability was discovered in GitLab versions before 13.0.12, 13.1.10, 13.2.8 and 13.3.4. GitLabs EKS integration was vulnerable to a cross-account assume role attack.
For GitLab before 13.0.12, 13.1.6, 13.2.3 after a group transfer occurs, members from a parent group keep their access level on the subgroup leading to improper access.