CVE-2025-3889
WordPress Simple PayPal Shopping Cart <= 5.1.3 - Insecure Direct Object Reference via 'quantity'
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
The WordPress Simple Shopping Cart plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 5.1.3 via the 'process_payment_data' due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to change the quantity of a product to a negative number, which subtracts the product cost from the total order cost. The attack will only work with Manual Checkout mode, as PayPal and Stripe will not process payments for a negative quantity.
| CWE | CWE-639 |
| Vendor | mra13 |
| Product | simple shopping cart |
| Published | May 1, 2025 |
| Last Updated | Apr 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
mra13 / Simple Shopping Cart
0 ≤ 5.1.3
References
wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/41212533-535e-4a9e-a9b8-1240021a3752?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/wordpress-simple-paypal-shopping-cart/tags/5.1.2/wp_shopping_cart.php#L324 tipsandtricks-hq.com: https://www.tipsandtricks-hq.com/ecommerce/wp-shopping-cart tipsandtricks-hq.com: https://www.tipsandtricks-hq.com/ecommerce/simple-shopping-cart-enabling-manual-offline-checkout plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/changeset/3284572/
Credits
Jack Taylor