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Start learningUpgrade org.jenkins-ci.plugins:ontrack
to version 3.4.1 or higher.
org.jenkins-ci.plugins:ontrack is a plugin that allows Jenkins to notify ontrack about events like build creation, status of running job, etc. but also allows Jenkins to require information from ontrack.
Affected versions of this package are vulnerable to Arbitrary Code Execution. Sandbox protection cab be circumvented during parsing, compilation, and script instantiation by providing a crafted Groovy script. This allowed users able to control the plugin’s job-specific configuration to bypass the sandbox protection and execute arbitrary code on the Jenkins master.