Jenkins 2.153 and earlier and LTS 2.138.3 and earlier are susceptible to a remote command injection via stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.
View the template here CVE-2018-1000861.yaml
References:
https://nvd.nist.gov/vuln/detail/CVE-2018-1000861