AWS CloudFormation example that allows a security group rule to reference the same security group as the source.

aws-cfn-self-referencing-sg.json

{
  "Description": "Create a VPC with a SG which references itself",
  "AWSTemplateFormatVersion": "2010-09-09",
  "Resources": {
    "vpctester": {
      "Type": "AWS::EC2::VPC",
      "Properties": {
        "CidrBlock": "172.16.0.0/23",
        "EnableDnsSupport": false,
        "EnableDnsHostnames": false,
        "InstanceTenancy": "default",
        "Tags": [ { "Key": "Name", "Value": "vpctester" } ]
      }
    },
    "sgtester": {
      "Type": "AWS::EC2::SecurityGroup",
      "DependsOn": "vpctester",
      "Properties": {
        "GroupDescription": "vpc tester sg",
        "VpcId": { "Ref": "vpctester" }
      }
    },
    "sgtesteringress": {
      "Type": "AWS::EC2::SecurityGroupIngress",
      "DependsOn": "sgtester",
      "Properties": {
        "GroupId": { "Ref": "sgtester" },
        "IpProtocol": "tcp",
        "FromPort": "0",
        "ToPort": "65535",
        "SourceSecurityGroupId": { "Ref": "sgtester" }
      }
    }
  }
}

Thanks, it was helpful

Thanks!