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Test your applicationsUpgrade org.jenkins-ci.plugins:gitlab-plugin
to version 1.9.7 or higher.
org.jenkins-ci.plugins:gitlab-plugin is an allows GitLab to trigger builds in Jenkins when code is committed or merge requests are opened / updated. It can also send build status back to GitLab.
Affected versions of this package are vulnerable to Improper Authorization due to an incorrect permission check in an HTTP endpoint. An attacker can enumerate credential IDs of GitLab API token credentials and Secret text credentials stored in Jenkins by exploiting the permission settings. This is only exploitable if attackers have global Item/Configure permission while lacking Item/Configure permission on any particular job.