An Insecure Direct Object Reference (IDOR) vulnerability exists in Craft Commerce’s cart functionality that allows users to hijack any shopping cart by knowing or guessing its 32-character number. This vulnerability enables the takeover of shopping sessions and potential exposure of PII.
The CartController accepts a user-supplied number parameter to load and modify shopping carts. No ownership validation is performed - the code only checks if the order exists and is incomplete, not whether the requester has authorization to access it.
// CartController.php:374-389 - actionLoadCart()
public function actionLoadCart(): ?Response
{
$number = $this->request->getParam('number');
if ($number === null) {
return $this->asFailure(Craft::t('commerce', 'A cart number must be specified.'));
}
// No ownership check - returns any cart to any requester
$cart = Order::find()->number($number)->isCompleted(false)->one();
// Cart is loaded into attacker's session without authorization
...
}
// CartController.php:606-616 - _getCart()
$orderNumber = $this->request->getBodyParam('number');
if ($orderNumber) {
// Same issue - no ownership validation
$cart = Order::find()->number($orderNumber)->isCompleted(false)->one();
// Returns cart to any requester who knows the number
}
{
"cwe_ids": [
"CWE-639"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-10T18:24:49Z",
"nvd_published_at": "2026-03-11T18:16:25Z",
"severity": "MODERATE"
}