This indicates an attack attempt to exploit a Privilege Escatlation Vulnerability in Harbor project Harbor.
A remote attacker could exploit this vulnerability by sending an API request with a crafted JSON payload. Successful exploitation of this vulnerability could allow the attacker to create users with admin privileges.
Harbor project Harbor prior to 1.7.6
Harbor project Harbor prior to 1.8.3
Privilege Escalation: Remote attackers can leverage their privileges on vulnerable systems.
Apply the most recent upgrade or patch from the vendor.