CVE-2026-94360 in Paymentfor Gateway Plugin
Summary
by MITRE • 10/14/2026
The Paymentfor Gateway for WooCommerce WordPress plugin before 1.0.6 does not verify the authenticity of an inbound payment notification before marking an order as paid, allowing unauthenticated attackers to mark orders as paid without any payment being completed.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified in the Payment for Gateway for WooCommerce WordPress plugin prior to version 1.0.6 represents a critical failure in authentication and integrity verification mechanisms within e-commerce transaction processing workflows. This flaw specifically affects how the plugin handles incoming webhooks or notifications from payment gateways, which are standard asynchronous messages used to inform merchant systems of the status of a customer's payment attempt. In secure implementations, these inbound notifications must be cryptographically signed or validated against shared secrets provided by the payment processor to ensure they originate from legitimate sources and have not been tampered with during transit. The absence of such verification in versions before 1.0.6 means that any entity capable of sending HTTP requests to the WordPress site can manipulate this state, effectively bypassing financial controls entirely.
From a technical perspective, the core issue lies in the lack of signature validation or token-based authentication for incoming payment callbacks. When an order is marked as paid within WooCommerce, it typically triggers downstream processes such as inventory deduction, email notifications to customers and staff, and fulfillment workflows. By failing to verify that the notification actually came from the authorized payment gateway service provider, the application accepts any payload claiming a successful transaction status. This allows unauthenticated attackers to craft arbitrary HTTP POST requests containing fake success statuses for specific order IDs. Since the plugin does not cross-reference these notifications with external API responses or validate cryptographic signatures provided by major gateways like Stripe, PayPal, or others supported by WooCommerce, it blindly trusts the input data regarding payment completion.
The operational impact of this vulnerability is severe and directly translates to financial loss for merchants utilizing this specific configuration. Attackers can exploit this flaw to mark orders as paid without actually completing a transaction through the legitimate banking infrastructure. This results in goods being shipped or digital services being delivered to malicious actors who have not provided any funds. Beyond direct theft, this undermines the integrity of sales records and inventory management systems, potentially leading to stock discrepancies and accounting errors that require manual reconciliation. For high-volume merchants, even small-scale exploitation can accumulate into significant revenue leakage over time if left unpatched.
This vulnerability aligns with CWE-347, which describes Improper Verification of Cryptographic Signature, as the system fails to ensure data integrity and authenticity upon receipt. It also maps closely to ATT&CK technique T1505.003, Server Software Component: Web Shell, in the broader context of unauthorized state changes via web application interfaces, though more specifically it reflects weaknesses in input validation and trust boundaries often categorized under CWE-287 Improper Authentication. The exploitation vector is remote and requires no prior access to the WordPress dashboard or database, making it particularly dangerous for publicly accessible sites that do not implement additional network-level protections such as IP whitelisting for webhook endpoints.
Mitigation strategies must prioritize immediate software updates alongside defensive architectural adjustments. The primary remediation step is upgrading the Payment for Gateway for WooCommerce plugin to version 1.0.6 or later, where developers have implemented proper verification logic for inbound payment notifications. In addition to updating the software, administrators should enforce strict access controls on webhook endpoints by restricting incoming traffic to known IP ranges associated with major payment processors using firewall rules or web application firewalls. Implementing additional layers of validation, such as verifying order existence and status consistency before processing callbacks, can further reduce risk. Regular security audits focusing on financial transaction flows are recommended to ensure that similar trust assumptions do not exist in other parts of the e-commerce stack.