CodeIgniter is a PHP full-stack web framework. This vulnerability allows attackers to execute arbitrary code when you use Validation Placeholders. The vulnerability exists in the Validation library, and validation methods in the controller and in-model validation are also vulnerable because they use the Validation library internally. This issue is patched in version 4.3.5.

Affected: Packagist: codeigniter4/framework

### Impact This vulnerability allows attackers to execute arbitrary code when you use Validation Placeholders.

The vulnerability exists in the Validation library, and validation methods in the controller and in-model validation are also vulnerable because they use the Validation library internally.

### Patches Upgrade to v4.3.5 or later.

### Workarounds Setting validation rules with an array.

E.g.: ```php $validation->setRules([ 'email' => ['required', 'valid_email, 'is_unique[users.email,id,{id}]'], ]); ```

### References - https://codeigniter4.github.io/userguide/libraries/validation.html#validation-placeholders - https://codeigniter4.github.io/userguide/incoming/controllers.html#validating-data - https://codeigniter4.github.io/userguide/models/model.html#in-model-validation

### For more information If you have any questions or comments about this advisory: * Open an issue in [codeigniter4/CodeIgniter4](https://github.com/codeigniter4/CodeIgniter4/issues) * Email us at [SECURITY.md](https://github.com/codeigniter4/CodeIgniter4/blob/develop/SECURITY.md)