Auth bypass in Mra13 Simple Shopping Cart
CVE-2025-3889
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000
Affected products
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/41212533-535e-4a9e-a9b8-12400… (Third Party Advisory)
- plugins.trac.wordpress.org/browser/wordpress-simple-paypal-shopping-cart/tags/5… (Product)
- www.tipsandtricks-hq.com/ecommerce/wp-shopping-cart (Product)
- www.tipsandtricks-hq.com/ecommerce/simple-shopping-cart-enabling-manual-offline… (Product)
- plugins.trac.wordpress.org/changeset/3284572/ (Patch)
Frequently asked questions
- What is CVE-2025-3889?
- CVE-2025-3889 is a medium-severity vulnerability in Mra13 Simple Shopping Cart, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.3/10. Published 2025-05-01.
- How severe is CVE-2025-3889?
- Medium severity. CVSS v3 base score is 5.3 out of 10.