Unauthenticated Payment Bypass in Paymob for WooCommerce

Executive Summary

The Paymob for WooCommerce WordPress plugin before version 4.1.14 has a flaw where it does not verify the request signature on a specific branch of its payment webhook. This allows unauthenticated attackers to exploit the webhook to mark arbitrary WooCommerce orders as paid without any actual payment being processed.

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Detection Guidance

Check if your Paymob for WooCommerce plugin version is below 4.1.14. Inspect webhook logs for unauthorized order status changes marked as paid without payment verification.

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Impact Analysis

If you use the affected plugin version, attackers could trick your system into believing orders were paid when they were not. This could lead to financial losses, as you might ship products or provide services without receiving payment. It also undermines trust in your order processing system.

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Compliance Impact

This vulnerability could impact compliance by allowing unauthorized transactions, which may violate data integrity and financial record-keeping requirements in standards like GDPR or HIPAA. Unverified payments could lead to incorrect financial reporting or unauthorized access to transaction data.

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Mitigation Strategies

Update the Paymob for WooCommerce plugin to version 4.1.14 or later immediately. Review recent orders marked as paid without transactions and verify their legitimacy.

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