An authorization issue relating to project maintainer impersonation was identified in GitLab EE 9.5 and later through 13.0.1 that could allow unauthorized users to impersonate as a maintainer to perform limited actions.
A security issue allowed achieving Denial of Service attacks through memory exhaustion by uploading malicious artifacts in all previous GitLab versions through 13.0.1
Missing permission check on fork relation creation in GitLab CE/EE 11.3 and later through 13.0.1 allows guest users to create a fork relation on restricted public projects via API