CVE-2026-94271 in Payment Gateway Plugin
Summary
by MITRE • 10/06/2026
The Deema Payment Gateway WordPress plugin through 1.1.2 does not verify the payment with the payment provider when handling the return from the hosted checkout, and does not check the payment status or amount, allowing unauthenticated users to have orders marked as paid without any payment being taken.
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Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified in Deema Payment Gateway WordPress plugin versions prior to 1.1.2 represents a critical failure in transaction integrity verification, specifically classified under CWE-345 Insufficient Verification of Data Authenticity and CWE-862 Missing Authorization. This flaw occurs during the asynchronous return phase of a hosted checkout process, where the payment provider redirects the user back to the merchant's site after processing a transaction. In this specific workflow, the plugin fails to perform any server-side validation with the original payment gateway API to confirm that the transaction was actually completed successfully by the financial institution. Instead, it relies entirely on client-supplied data or simple state transitions triggered by the redirect event itself. This architectural decision bypasses the fundamental security principle of trusting only verified external sources for critical business logic such as order status updates and inventory management.
From a technical perspective, the absence of signature verification or token validation allows an unauthenticated attacker to manipulate the return URL parameters. By crafting specific HTTP requests that mimic the structure expected by the plugin upon successful payment completion, an actor can force the system to transition any pending order into a paid state without initiating a real financial transaction. This is not merely a cross-site scripting issue but a fundamental logic flaw where the application assumes that reaching this endpoint equates to a valid payment event. The lack of checks on the payment amount further exacerbates the risk, as an attacker could potentially manipulate values if they were processed, although in this specific case, the primary impact is simply marking orders as paid regardless of actual monetary exchange. This behavior directly violates CWE-862 Missing Authorization because the system grants access to a privileged state change (order completion) without verifying that the user has legitimately fulfilled the financial obligation required for such an action.
The operational impact of this vulnerability is severe, leading directly to revenue loss and potential fraud exploitation. E-commerce businesses relying on this plugin are susceptible to individuals placing orders for high-value goods or services and receiving them after marking their own transactions as paid via automated scripts or manual manipulation. This results in the shipment of merchandise without corresponding funds being deposited into the merchant's account. Furthermore, such vulnerabilities can be chained with other issues like inventory exhaustion attacks, where an attacker rapidly places multiple fake paid orders to deplete stock availability for legitimate customers. The integrity of financial records is also compromised, as accounting systems will reflect revenue that was never received, complicating audits and financial reporting processes.
Mitigation strategies must prioritize immediate patching by upgrading the Deema Payment Gateway plugin to version 1.1.3 or later, where these validation checks have been implemented. In addition to updating software, merchants should implement server-side verification for all payment return events. This involves querying the payment provider's API using a secure transaction ID provided in the redirect parameters to confirm the actual status and amount before marking an order as complete. Implementing webhook-based notifications from the payment gateway is also recommended over relying solely on client redirects, as webhooks are less susceptible to manipulation by end-users. Additionally, integrating CAPTCHA or rate-limiting mechanisms can help mitigate automated exploitation attempts while longer-term architectural improvements are deployed to ensure that no state change occurs without explicit confirmation from a trusted third-party financial service provider.