Jenkins GitLab Plugin 1.2149.vcfc32c82b_f7f and earlier caches the GitLab API client built for alternative GitLab API token credentials under a cache key derived from the credentials ID alone, omitting the folder in which the credentials are resolved, allowing attackers with Item/Configure permission to access GitLab API token credentials they are not entitled to use.
https://www.jenkins.io/security/advisory/2026-09-16/#SECURITY-3851