This indicates an attack attempt to exploit a Remote Code Execution Vulnerability in Atlassian Confluence.
The vulnerability is due to insufficient input validation while handling a malicious request. A remote attacker may be able to exploit this to execute arbitrary code via a crafted HTTP request.
versions prior to
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html