Sonatype Nexus Repository before 3.21.2 allows JavaEL Injection (issue 1 of 2).
https://support.sonatype.com/hc/en-us/articles/360044882533
https://cwe.mitre.org/data/definitions/917.html
http://packetstormsecurity.com/files/160835/Sonatype-Nexus-3.21.1-Remote-Code-Execution.html