executionRoleName

[Self-managed permissions] The name of the IAM execution role to use to update the stack set. If you do not specify an execution role, CloudFormation uses the AWSCloudFormationStackSetExecutionRole role for the StackSet operation.

Specify an IAM role only if you are using customized execution roles to control which stack resources users and groups can include in their StackSets.

If you specify a customized execution role, CloudFormation uses that role to update the stack. If you do not specify a customized execution role, CloudFormation performs the update using the role previously associated with the StackSet, so long as you have permissions to perform operations on the StackSet.