$fillable and $guarded precedence

The order in which $fillable and $guarded are evaluated is as follows:

1. If $guarded is set to an empty array ($guarded = []), it allows mass assignment of all properties, regardless of the $fillable array.
2. If $guarded is not set to an empty array, then the $fillable array is evaluated. Only the attributes listed in the $fillable array are allowed for mass assignment.

In your case, if you remove the $guarded = [] code, it will default to the Laravel's default behavior, which is to guard against mass assignment. This means that you will need to explicitly define the attributes that are allowed for mass assignment in the $fillable array.

To maintain the current functionality and remove the security issue, you can add every attribute to the $fillable array. This way, only the attributes listed in the $fillable array will be allowed for mass assignment.

Here's an example of how you can define the $fillable array in your model:

protected $fillable = ['attribute1', 'attribute2', 'attribute3'];

Replace 'attribute1', 'attribute2', 'attribute3' with the actual attributes you want to allow for mass assignment.

Remember to always validate user input before mass assigning it to your models to ensure data integrity and security.