An issue has been discovered in GitLab affecting all versions starting from 12.8 before 15.7.8, all versions starting from 15.8 before 15.8.4, all versions starting from 15.9 before 15.9.2. This vulnerability could allow a user to unmask the Discord Webhook URL through viewing the raw API response.
https://hackerone.com/reports/1796210
https://gitlab.com/gitlab-org/gitlab/-/issues/385669
https://gitlab.com/gitlab-org/cves/-/blob/master/2022/CVE-2022-4462.json