The RichFaces Framework 3.X through 3.3.4 is vulnerable to Expression Language (EL) injection via the UserResource resource. A remote, unauthenticated attacker could exploit this to execute arbitrary code using a chain of java serialized objects via org.ajax4jsf.resource.UserResource$UriData.
https://access.redhat.com/errata/RHSA-2018:3581
https://access.redhat.com/errata/RHSA-2018:3519
https://access.redhat.com/errata/RHSA-2018:3518
https://access.redhat.com/errata/RHSA-2018:3517
http://www.securitytracker.com/id/1042037
http://seclists.org/fulldisclosure/2020/Mar/21