Executive brief
Jenkins Script Security Plugin is a core security component that prevents user-written scripts and pipelines from performing unsafe operations. This vulnerability allows an attacker with permissions to write and execute scripts (including Jenkins Pipelines) to bypass this sandbox protection and run arbitrary code with Jenkins controller privileges. An exploit could lead to full compromise of the Jenkins instance and any systems it manages.
Technical details
The vulnerability exists in Script Security Plugin versions 1415.v9a_f9b_3a_c253d and earlier. When Groovy coerces a value to an interface by creating a proxy, the plugin fails to intercept and check the method call if the underlying value inherits a method of the same name as the interface method. This allows an attacker with script-definition permissions to call arbitrary methods on the inherited implementation, bypassing sandbox checks. The attack requires the ability to define and run sandboxed scripts or Pipelines within Jenkins. The fix in version 1422.v06869826dd9b_ rejects such coercions when a method name collision exists.
Affected products
- Jenkins Script Security Plugin 1415.v9a_f9b_3a_c253d and earlier
Timeline
- 2026-09-16: disclosed: Published in Jenkins Security Advisory 2026-09-16
- 2026-09-16: patched: Fixed in version 1422.v06869826dd9b_