CVE-2026-9189

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Contact Form 7 \u2013 PayPal & Stripe Add-on", "vendor": "scottpaterson", "versions": [{"lessThanOrEqual": "2.4.9", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@wordfence.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The Contact Form 7 \u2013 PayPal & Stripe Add-on plugin for WordPress is vulnerable to Payment Bypass via Insufficient Verification of Data Authenticity in all versions up to, and including, 2.4.9. Although `cf7pp_paypal_ipn_handler()` correctly validates IPN authenticity by posting back to PayPal with `cmd=_notify-validate`, it fails to compare the IPN payload's `mc_gross` (payment amount), `mc_currency`, or `receiver_email` fields against the corresponding stored order values before passing the attacker-controlled `invoice` field directly to `cf7pp_complete_payment()`, which marks the order completed after only an integer cast with no amount verification. This makes it possible for unauthenticated attackers to mark arbitrary high-value pending orders as fully paid by making a minimal real PayPal payment and crafting an IPN whose `invoice` parameter references the targeted order, effectively completing purchases without tendering the required payment amount."}, {"lang": "es", "value": "El plugin Contact Form 7 \u2013 PayPal & Stripe Add-on para WordPress es vulnerable a una Omisi\u00f3n de Pago (Payment Bypass) a trav\u00e9s de una Verificaci\u00f3n Insuficiente de la Autenticidad de los Datos en todas las versiones hasta la 2.4.9, inclusive. Aunque `cf7pp_paypal_ipn_handler()` valida correctamente la autenticidad del IPN al enviar una publicaci\u00f3n de vuelta a PayPal con `cmd=_notify-validate`, no compara los campos `mc_gross` (importe del pago), `mc_currency` o `receiver_email` del payload del IPN con los valores de pedido almacenados correspondientes antes de pasar el campo `invoice` controlado por el atacante directamente a `cf7pp_complete_payment()`, el cual marca el pedido como completado despu\u00e9s de solo una conversi\u00f3n a entero sin verificaci\u00f3n de importe. Esto hace posible que atacantes no autenticados marquen pedidos pendientes arbitrarios de alto valor como totalmente pagados al realizar un pago real m\u00ednimo de PayPal y elaborar un IPN cuyo par\u00e1metro `invoice` haga referencia al pedido objetivo, completando efectivamente las compras sin abonar el importe de pago requerido."}], "id": "CVE-2026-9189", "lastModified": "2026-07-21T12:10:00.090", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security@wordfence.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-9189", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-29T10:00:42.885449Z", "version": "2.0.3"}}]}, "published": "2026-05-29T09:16:18.560", "references": [{"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/contact-form-7-paypal-add-on/tags/2.4.6/includes/payments/functions.php#L31"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/contact-form-7-paypal-add-on/tags/2.4.6/includes/payments/paypal_handler.php#L106"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/contact-form-7-paypal-add-on/tags/2.4.6/includes/payments/paypal_handler.php#L75"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/contact-form-7-paypal-add-on/tags/2.4.8/includes/payments/functions.php#L31"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/contact-form-7-paypal-add-on/tags/2.4.8/includes/payments/paypal_handler.php#L106"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/contact-form-7-paypal-add-on/tags/2.4.8/includes/payments/paypal_handler.php#L75"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/changeset/3551197/contact-form-7-paypal-add-on"}, {"source": "security@wordfence.com", "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/5e274781-1c20-4224-bc10-26dadb9b1e07?source=cve"}], "sourceIdentifier": "security@wordfence.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-345"}], "source": "security@wordfence.com", "type": "Secondary"}]}

{}

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