Improper sanitization of branch names in GitLab Runner affecting all versions prior to 15.3.5, 15.4 prior to 15.4.4, and 15.5 prior to 15.5.2 allows a user who creates a branch with a specially crafted name and gets another user to trigger a pipeline to execute commands in the runner as that other user.

An issue has been discovered in GitLab Runner affecting all versions starting from 13.4.0 before 13.4.2, all versions starting from 13.3.0 before 13.3.7, all versions starting from 13.2.0 before 13.2.10. Insecure Runner Configuration in Kubernetes Environments