A data modification vulnerability exists in Jenkins Job Import Plugin 3.0 and earlier in JobImportAction.java that allows attackers to copy jobs from a preconfigured other Jenkins instance, potentially installing additional plugins necessary to load the imported job's configuration.
https://github.com/advisories/GHSA-8crr-xf35-5f5p
https://jenkins.io/security/advisory/2019-01-28/#SECURITY-1302