Cloudbees · Jenkins · CVE-2015-8103
**Name of the Vulnerable Software and Affected Versions**
Jenkins versions prior to 1.638
Jenkins LTS versions prior to 1.625.2
**Description**
The issue allows remote attackers to execute arbitrary code via a crafted serialized Java object, related to a problematic `webapps/ROOT/WEB-INF/lib/commons-collections-*.jar` file and the "Groovy variant in `ysoserial`".
**Recommendations**
For Jenkins versions prior to 1.638, update to version 1.638 or later.
For Jenkins LTS versions prior to 1.625.2, update to version 1.625.2 or later.
As a temporary workaround, consider restricting access to the Jenkins CLI subsystem until a patch is available.