attack from file manager

Operating System & Version
Linux 3.10.0-962.3.2.lve1.5.54.el7.x86_64
cPanel & WHM Version
CloudLinux v7.9.0 [server]

hft

Registered
Nov 17, 2021
2
0
1
palestine
cPanel Access Level
Root Administrator
hi
I am using cPanel for multi server,
but one of this server someone upload file from file manager without using username and password, I am search for this problem but no solution ,this file redirect to Cyber.bet.
how can solve this problem?
thank you ,,,
 

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hft

Registered
Nov 17, 2021
2
0
1
palestine
cPanel Access Level
Root Administrator
The problem is that he sends a post on the file manager and attaches files to the hosting, which is a stranger who does not have access data. The previous attachment shows the form of the request.
Attached file is one of the files uploaded to the server.
 

Attachments