Certain SAST CiConfiguration information could be viewed by unauthorized users in GitLab EE starting with 13.3. This information was exposed through GraphQL to non-members of public projects with repository visibility restricted as well as guest members on private projects. Affected versions are: >=13.3, <13.3.9,>=13.4, <13.4.5,>=13.5, <13.5.2.
https://hackerone.com/reports/965602
https://gitlab.com/gitlab-org/gitlab/-/issues/244921
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26406.json