{"id":"GHSA-vff3-pqq8-4cpq","aliases":["CVE-2026-31867"],"title":"Craft Commerce: Potential IDOR in Commerce carts","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"MODERATE","description":"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.\n\n## Vulnerability Details\n\n### Root Cause\n\nThe `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.\n\n```php\n// CartController.php:374-389 - actionLoadCart()\npublic function actionLoadCart(): ?Response\n{\n    $number = $this->request->getParam('number');\n\n    if ($number === null) {\n        return $this->asFailure(Craft::t('commerce', 'A cart number must be specified.'));\n    }\n\n    // No ownership check - returns any cart to any requester\n    $cart = Order::find()->number($number)->isCompleted(false)->one();\n\n    // Cart is loaded into attacker's session without authorization\n    ...\n}\n```\n\n```php\n// CartController.php:606-616 - _getCart()\n$orderNumber = $this->request->getBodyParam('number');\nif ($orderNumber) {\n    // Same issue - no ownership validation\n    $cart = Order::find()->number($orderNumber)->isCompleted(false)->one();\n    // Returns cart to any requester who knows the number\n}\n```\n---\n\n## Attack Scenario\n\n### Prerequisites\n- Target Craft Commerce installation with active shopping carts\n- Knowledge of a victim’s cart number (32-character hex string)\n\n### Cart Number Acquisition Vectors\n\n1. **Referrer Header Leakage**: Cart URLs shared externally expose the number\n2. **Browser History**: Accessible on shared/compromised devices\n3. **Proxy/WAF Logs**: Cart numbers logged in URL parameters\n4. **Social Engineering**: Support tickets, screenshots containing cart URLs\n5. **Brute Force**: While impractical for random targeting, feasible for targeted attacks against recently-created carts\n\n---","severity":"medium","score":6.3,"published":"2026-03-10T18:24:49.000Z","modified":"2026-03-13T10:48:12.376Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"craftcms/commerce","sources":[{"name":"OSV · GHSA-vff3-pqq8-4cpq","url":"https://osv.dev/vulnerability/GHSA-vff3-pqq8-4cpq"}],"ranges":[{"events":[{"introduced":"5.0.0"},{"fixed":"5.6.0"}],"type":"ECOSYSTEM"}],"versions":["5.0.0","5.0.1","5.0.10","5.0.10.1","5.0.11","5.0.11.1","5.0.12","5.0.12.1","5.0.12.2","5.0.13","5.0.14","5.0.15","5.0.16","5.0.16.1","5.0.16.2","5.0.17","5.0.18","5.0.19","5.0.2","5.0.3","5.0.4","5.0.5","5.0.6","5.0.7","5.0.8","5.0.9","5.1.0","5.1.0-beta.1","5.1.0-beta.2","5.1.0-beta.3","5.1.0.1","5.1.1","5.1.2","5.1.3","5.1.4","5.2.0","5.2.1","5.2.10","5.2.11","5.2.12","5.2.12.1","5.2.2","5.2.2.1","5.2.3","5.2.4","5.2.5","5.2.6","5.2.7","5.2.8","5.2.9","5.2.9.1","5.3.0","5.3.0.1","5.3.0.2","5.3.1","5.3.10","5.3.11","5.3.12","5.3.13","5.3.2","5.3.2.1","5.3.2.2","5.3.3","5.3.4","5.3.5","5.3.6","5.3.7","5.3.8","5.3.9","5.4.0","5.4.1","5.4.1.1","5.4.10","5.4.2","5.4.3","5.4.4","5.4.5","5.4.5.1","5.4.6","5.4.7","5.4.7.1","5.4.8","5.4.9","5.5.0","5.5.0.1","5.5.1","5.5.2","5.5.3","5.5.4"],"fixed":["5.6.0"]},{"ecosystem":"Packagist","name":"craftcms/commerce","sources":[{"name":"OSV · GHSA-vff3-pqq8-4cpq","url":"https://osv.dev/vulnerability/GHSA-vff3-pqq8-4cpq"}],"ranges":[{"events":[{"introduced":"4.0.0"},{"fixed":"4.11.0"}],"type":"ECOSYSTEM"}],"versions":["4.0.0","4.0.1","4.0.2","4.0.3","4.0.4","4.1.0","4.1.1","4.1.2","4.1.3","4.10.0","4.10.1","4.10.2","4.2.0","4.2.1","4.2.10","4.2.11","4.2.2","4.2.3","4.2.4","4.2.5","4.2.5.1","4.2.6","4.2.7","4.2.8","4.2.9","4.3.0","4.3.1","4.3.2","4.3.3","4.4.0","4.4.1","4.4.1.1","4.5.0","4.5.1","4.5.1.1","4.5.2","4.5.3","4.5.4","4.6.0","4.6.1","4.6.10","4.6.11","4.6.12","4.6.13","4.6.14","4.6.2","4.6.3.1","4.6.4","4.6.5","4.6.6","4.6.7","4.6.8","4.6.9","4.7.0","4.7.1","4.7.2","4.7.3","4.8.0","4.8.0.1","4.8.1","4.8.1.1","4.8.1.2","4.8.2","4.8.3","4.8.4","4.9.0","4.9.1","4.9.2","4.9.3","4.9.4"],"fixed":["4.11.0"]}],"sourceAffected":[],"references":["https://github.com/craftcms/commerce/security/advisories/GHSA-vff3-pqq8-4cpq","https://nvd.nist.gov/vuln/detail/CVE-2026-31867","https://github.com/craftcms/commerce/pull/4207","https://github.com/craftcms/commerce"],"sources":[{"name":"OSV","id":"GHSA-vff3-pqq8-4cpq","modified":"2026-03-13T10:48:12.376823Z","url":"https://osv.dev/vulnerability/GHSA-vff3-pqq8-4cpq"}],"assessments":[{"source":"OSV","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N","score":6.3}],"products":[],"remediation":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T18:20:33.032Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}