The combination filter Groovy script in Jenkins before 1.600 and LTS before 1.596.1 allows remote authenticated users with job configuration permission to gain privileges and execute arbitrary code on the master via unspecified vectors.

For users using "'Jenkins' own user database" setting, Jenkins doesn't refuse reserved names, thus allowing privilege escalation.

External References:

https://wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2015-02-27

Jenkins before 1.600 and LTS before 1.596.1 allows remote authenticated users to cause a denial of service (improper plug-in and tool installation) via crafted update center data.

Directory traversal vulnerability in Jenkins before 1.600 and LTS before 1.596.1 allows remote authenticated users with certain permissions to read arbitrary files via a symlink, related to building artifacts.