A sandbox bypass vulnerability exists in Jenkins Pipeline: Groovy Plugin 2.63 and earlier in pom.xml, src/main/java/org/jenkinsci/plugins/workflow/cps/CpsGroovyShell.java that allows attackers able to control pipeline scripts to execute arbitrary code on the Jenkins master JVM.
https://jenkins.io/security/advisory/2019-03-06/#SECURITY-1336%20%282%29
https://access.redhat.com/errata/RHSA-2019:0739
http://www.securityfocus.com/bid/107476
http://packetstormsecurity.com/files/159603/Jenkins-2.63-Sandbox-Bypass.html