A arbitrary file read vulnerability exists in Jenkins 2.132 and earlier, 2.121.1 and earlier in the Stapler web framework's org/kohsuke/stapler/Stapler.java that allows attackers to send crafted HTTP requests returning the contents of any file on the Jenkins master file system that the Jenkins master has access to.
https://www.oracle.com/security-alerts/cpuapr2022.html
https://www.exploit-db.com/exploits/46453/
https://jenkins.io/security/advisory/2018-07-18/#SECURITY-914