CS-Cart v3.0.4 configured with PayPal Standard Payments design vulnerability

ID VU:583564
Type cert
Reporter CERT
Modified 2013-02-22T00:00:00



CS-Cart v3.0.4 and possibly other versions configured with PayPal Standard Payment is susceptible to a client-side attack that results in an attacker purchasing items without having to pay for them.


It has been reported that CS-Cart v3.0.4 configured with PayPal Standard Payments contains a design flaw that allows an attacker to buy items without having to pay for them. The parameter for the merchant's PayPal email address is controlled on the client-side and not verified by the server. This allows an attacker to change the PayPal email address to one the attacker controls allowing the attacker to purchase items on a website but effectively pay themselves instead of the merchant. Manual verification of website orders with the PayPal transactions would need to be performed to detect this fraud.


An attacker can effectively purchase items without paying the merchant for them.



The vendor has stated that this vulnerability has been addressed in CS-Cart version 3.0.6. They have also released the security patch for the older versions (3.0.x & 2.2.x).

Vendor Information

Vendor| Status| Date Notified| Date Updated
CS-Cart| | 24 Jan 2013| 18 Feb 2013
If you are a vendor and your product is affected, let us know.

CVSS Metrics

Group | Score | Vector
Base | 7.1 | AV:N/AC:M/Au:N/C:N/I:C/A:N
Temporal | 4.7 | E:U/RL:OF/RC:UC
Environmental | 1.3 | CDP:L/TD:L/CR:ND/IR:ND/AR:ND


  • <https://www.cs-cart.com/overview.html>


Thanks to Giancarlo Pellegrino Institute Eurecom and SAP Research for reporting this vulnerability.

This document was written by Michael Orlando.

Other Information

  • CVE IDs: CVE-2013-0118
  • Date Public: 15 Feb 2013
  • Date First Published: 22 Feb 2013
  • Date Last Updated: 22 Feb 2013
  • Document Revision: 11