An info leak issue was identified in all versions of GitLab EE from 13.7 prior to 15.4.6, 15.5 prior to 15.5.5, and 15.6 prior to 15.6.1 which exposes user email id through webhook payload.
https://gitlab.com/gitlab-org/gitlab/-/issues/373819
https://gitlab.com/gitlab-org/cves/-/blob/master/2022/CVE-2022-4255.json