Solved❓ Backdoor or Nah?

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❓ Backdoor or Nah?

I've asked a handful of people if this code is abusable/exploitable and the 'yes' to 'no' ratio was about 50:50 and I'm code illiterate so I don't have a single clue about it.

Code:

if SERVER then
    util.AddNetworkString( "RunLua" )
    
    local PLAYER = FindMetaTable( "Player" )
    
    function PLAYER:RunLua( lua )
        net.Start( "RunLua" )
            net.WriteString( lua )
        net.Send( self )
    end
else
    net.Receive( "RunLua", function()
        local lua = net.ReadString()
        RunString( lua )
    end )
end

If this is abusable/exploitable in any way tell me how you do it. and maybe a way to fix it?