This indicates an attack attempt to exploit a remote Code Execution vulnerability in Teampass.
The vulnerability is due to a lack of input validation when processing file uploading HTTP requests. An attacker can exploit this to execute arbitrary code within the context of the target application, via a crafted request.
Teampass.net Teampass prior to 22.214.171.124
System Compromise: Remote attackers can execute arbitrary code within the context of the target application.
Apply the latest patch from the vendor.