This indicates an attack attempt to exploit a Directory Traversal vulnerability in WordPress.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application. Successful attacks may allow a remote attacker to view arbitrary local files within the context of the application, crash the affected application or deny services to legitimate users.
Any vulnerable WordPress version or Plugins
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply patch if available from the vendor's website.