A sandbox bypass vulnerability exists in Jenkins Script Security Plugin 1.53 and earlier in src/main/java/org/jenkinsci/plugins/scriptsecurity/sandbox/groovy/GroovySandbox.java, src/main/java/org/jenkinsci/plugins/scriptsecurity/sandbox/groovy/SecureGroovyScript.java that allows attackers with Overall/Read permission to execute arbitrary code on the Jenkins master JVM.
https://jenkins.io/security/advisory/2019-03-06/#SECURITY-1336%20%281%29
https://access.redhat.com/errata/RHSA-2019:0739
http://www.securityfocus.com/bid/107476
http://packetstormsecurity.com/files/166778/Jenkins-Remote-Code-Execution.html