CVE-2026-104641
Deferred Deferred - Pending Action

Unauthenticated PayPal Payment Verification Bypass in Simple Shopping Cart

Publication date: 2026-10-21

Last updated on: 2026-10-21

Assigner: WPScan

Description
The Simple Shopping Cart WordPress plugin before 5.3.3 does not verify that a PayPal payment notification is for a payment received by the site owner's PayPal account in its default configuration, allowing unauthenticated attackers to have their orders marked as paid using a payment made to an account they control.

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Meta Information

Published
2026-10-21
Last Modified
2026-10-21
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-09
NVD
CVE-2026-104641
EUVD
EUVD-2026-107143

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Unknown Simple Shopping Cart 0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-345 The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

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Executive Summary

The Simple Shopping Cart WordPress plugin before version 5.3.3 has a flaw where it does not verify if a PayPal payment notification is for a payment received by the site owner's PayPal account. This allows unauthenticated attackers to mark their orders as paid by using a payment made to an account they control.

Detection Guidance

Check the installed version of the Simple Shopping Cart WordPress plugin. If it is below 5.3.3, the system is vulnerable. Use commands like 'wp plugin list' in WordPress CLI or inspect the plugin files for version information.

Impact Analysis

This vulnerability could allow attackers to receive products or services without paying the site owner. It may result in financial losses for the site owner and undermine trust in the payment process. Users should update to version 5.3.3 or later to prevent exploitation.

Compliance Impact

This vulnerability could potentially violate compliance with standards like GDPR and HIPAA by allowing unauthorized transactions to be marked as paid without proper verification. Unauthenticated attackers could manipulate payment statuses, leading to financial discrepancies and potential data integrity issues. This may result in non-compliance with requirements for secure payment processing and transaction verification.

Mitigation Strategies

Update the Simple Shopping Cart plugin to version 5.3.3 or later immediately. Disable the plugin temporarily if an update is not immediately possible. Monitor for suspicious transactions or unauthorized orders.

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