CVE-2026-66461 in UPI Gateway Plugin
Summary
by MITRE • 08/13/2026
Unauthenticated Broken Access Control in SMEPay: UPI Gateway for WooCommerce <= 1.0.5 versions.
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Analysis
by VulDB Data Team • 08/13/2026
The vulnerability identified in SMEPay UPI Gateway for WooCommerce versions 1.0.5 and earlier represents a critical unauthenticated broken access control flaw that fundamentally undermines the security posture of the payment processing system. This issue stems from insufficient authentication mechanisms within the plugin's administrative interfaces, allowing any remote attacker to bypass legitimate user verification processes and gain unauthorized access to sensitive functionality. The vulnerability is classified under CWE-284 which specifically addresses improper access control, making it a direct violation of fundamental security principles that should be enforced at all levels of application architecture.
The technical implementation of this flaw manifests through the absence of proper authentication checks on critical administrative endpoints within the WooCommerce plugin. Attackers can exploit this weakness by directly accessing backend functionality without requiring valid credentials or session tokens, effectively granting them complete control over payment processing configurations, transaction monitoring, and customer data management. The vulnerability is particularly concerning because it affects a payment gateway plugin that handles sensitive financial transactions, creating potential pathways for unauthorized fund transfers, data exfiltration, and fraudulent activities. This type of access control failure aligns with ATT&CK technique T1078 which covers legitimate credentials usage and privilege escalation through compromised accounts.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass complete system compromise and financial risk exposure for merchants using affected versions. Attackers can manipulate transaction records, modify payment processing parameters, and potentially redirect funds to malicious accounts without detection. The implications are particularly severe in e-commerce environments where WooCommerce plugins handle real-time financial transactions and customer payment information. Organizations using SMEPay UPI Gateway for WooCommerce remain vulnerable to persistent threats that could lead to significant financial losses, regulatory compliance violations, and reputational damage.
Mitigation strategies should prioritize immediate version updates to the latest stable release of SMEPay UPI Gateway for WooCommerce where the access control vulnerabilities have been addressed through proper authentication implementation. Security administrators must also implement network-level restrictions such as firewall rules that limit access to administrative interfaces to trusted IP addresses only, while ensuring that all administrative accounts utilize strong multi-factor authentication mechanisms. Additional defensive measures include regular security audits of installed plugins, monitoring for unauthorized administrative access attempts, and implementing comprehensive logging of all administrative activities. Organizations should also consider deploying web application firewalls to detect and prevent exploitation attempts targeting known access control vulnerabilities in their e-commerce infrastructure.