An issue has been discovered in GitLab affecting all versions starting from 15.5 before 15.7.8, all versions starting from 15.8 before 15.8.4, all versions starting from 15.9 before 15.9.2. Non-project members could retrieve release descriptions via the API, even if the release visibility is restricted to project members only in the project settings.
https://hackerone.com/reports/1824226
https://gitlab.com/gitlab-org/gitlab/-/issues/387870
https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-0223.json