This indicates an attack attempt to exploit a Directory Traversal vulnerability in Nuxeo Platform.
The vulnerability is due to insufficient sanitizing of the "X-File-Name" header when handling files uploaded by a user. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application.
Nuxeo Platform 6.0
Nuxeo Platform 7.1
Nuxeo Platform 7.2
Nuxeo Platform 7.3
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.