Jenkins Script Security Plugin is vulnerable to arbitrary code execution attacks. This exists in the src/main/java/org/jenkinsci/plugins/scriptsecurity/sandbox/groovy/GroovySandbox.java
and src/main/java/org/jenkinsci/plugins/scriptsecurity/sandbox/groovy/SecureGroovyScript.java
which allows attackers with Overall/Read permission to execute arbitrary code on the Jenkins master JVM.