GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.0 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an authenticated user with a read_api scoped OAuth application to create issues and add comments to issues in private projects due to improper authorization.
https://hackerone.com/reports/3508895
https://gitlab.com/gitlab-org/gitlab/-/work_items/587270
https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/