CVE-2026-111957 in SUMIT Payment Gateway Plugin
Summary
by MITRE • 10/21/2026
The SUMIT Payment Gateway for WooCommerce WordPress plugin before 4.0.0 does not bind the payment it confirms with the provider to the order being completed, nor check the payment amount against the order total, allowing unauthenticated users to mark a pending order as paid by replaying a payment identifier obtained from any single genuine payment.
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified in SUMIT Payment Gateway for WooCommerce versions prior to 4.0.0 represents a critical flaw in transaction verification logic within the WordPress e-commerce ecosystem. This issue stems from an insecure direct object reference combined with a lack of cryptographic binding between the external payment provider's response and the internal order state. Specifically, when the plugin receives a callback or notification from the payment gateway indicating that a transaction has been confirmed, it fails to validate whether this confirmation corresponds to the specific WooCommerce order currently being processed. Furthermore, there is no mechanism in place to verify that the monetary amount reported by the provider matches the total value of the pending order. This absence of validation creates a significant security gap that undermines the integrity of financial transactions and allows for unauthorized state manipulation.
From an operational perspective, this flaw enables unauthenticated attackers to manipulate order statuses without possessing valid credentials or completing legitimate payments. By intercepting or obtaining a payment identifier from any single genuine transaction, whether through network sniffing if not properly secured via HTTPS or by observing public success pages, an attacker can replay this identifier against the plugin's callback endpoint. The system accepts this input and marks a pending order as paid, effectively granting access to digital goods or triggering fulfillment processes for physical goods without actual payment being made. This bypasses the core security controls of the e-commerce platform, allowing attackers to acquire products or services at no cost while potentially causing financial loss through inventory depletion or false revenue reporting.
This vulnerability aligns with CWE-345 Insufficient Verification of Data Authenticity and CWE-287 Improper Authentication, as the system fails to properly authenticate the source and integrity of the payment confirmation data. In terms of attack vectors, this behavior is consistent with ATT&CK technique T1190 Exploit Public-Facing Application, where an attacker leverages a vulnerability in a publicly accessible application component to gain unauthorized access or modify state. The lack of amount verification also relates to CWE-354 Improper Validation of Integrity Check Value, as the system does not ensure that the data received from the external party matches the expected values defined by the internal order context.
To mitigate this vulnerability, immediate action is required for all administrators running affected versions of the SUMIT Payment Gateway plugin. The primary remediation step is to upgrade the plugin to version 4.0.0 or later, where these validation checks have been implemented. Until an update can be applied, site operators should consider implementing additional server-side logic via custom code snippets that verify the order ID and total amount against the payment gateway's response before updating the order status. Additionally, ensuring that all communication with the payment provider is strictly secured using HTTPS helps prevent simple network-level interception of transaction identifiers, although this does not fully mitigate replay attacks if the identifier itself is sufficient for state change without further cryptographic proof such as a digital signature or hash-based message authentication code tied to the specific order details.