Published: 24 February 2016
The session-persistence implementation in Apache Tomcat 6.x before 6.0.45, 7.x before 7.0.68, 8.x before 8.0.31, and 9.x before 9.0.0.M2 mishandles session attributes, which allows remote authenticated users to bypass intended SecurityManager restrictions and execute arbitrary code in a privileged context via a web application that places a crafted object in a session.
From the Ubuntu security team
It was discovered that the Tomcat session-persistence implementation incorrectly handled session attributes. A remote attacker could possibly use this issue to execute arbitrary code in a privileged context.
CVSS 3 base score: 8.8
list of backports is incomplete. Fix is intrusive.