In all versions of GitLab CE/EE, provided a user ID, anonymous users can use a few endpoints to retrieve information about any GitLab user.
In all versions of GitLab CE/EE, provided a user ID, anonymous users can use a few endpoints to retrieve information about any GitLab user.
https://about.gitlab.com/releases/2021/09/30/security-release-gitlab-14-3-1-released/#user-enumeration-vulnerability