Jenkins before versions 2.44 and 2.32.2 is vulnerable to an insufficient permission check. This allows users with permissions to create new items (e.g. jobs) to overwrite existing items they don't have access to (SECURITY-321).
https://jenkins.io/security/advisory/2017-02-01/
https://github.com/jenkinsci/jenkins/commit/4ed5c850b6855ab064a66d02fb338f366853ce89