EUVD-2026-275709

fkie_cve-2026-31867

Craft Commerce is an ecommerce platform for Craft CMS. Prior to 4.11.0 and 5.6.0, 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. 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. This vulnerability enables the takeover of shopping sessions and potential exposure of PII. This vulnerability is fixed in 4.11.0 and 5.6.0.

GHSA-vff3-pqq8-4cpq — Craft Commerce: Potential IDOR in Commerce carts

Affected: Packagist: craftcms/commerce

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.

## Vulnerability Details

### Root Cause

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.

```php // 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 ... } ```

```php // 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 } ``` ---

## Attack Scenario

### Prerequisites - Target Craft Commerce installation with active shopping cart…

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EUVD-2026-275709

fkie_cve-2026-31867

GHSA-vff3-pqq8-4cpq — Craft Commerce: Potential IDOR in Commerce carts