CVE-2026-118757 in Disable Payment Method for WooCommerce Plugin
Summary
by MITRE • 10/28/2026
PiWeb Disable payment method / Partial payment for WooCommerce before 1.1.10.9 contains a missing authorization vulnerability in the update_fees AJAX handler that allows unauthenticated attackers to modify and read other customers' orders. Attackers can reuse a nonce from their own order-pay page and supply sequential order_id values to change payment methods, recalculate fees, and disclose order line items and totals.
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Analysis
by VulDB Data Team • 10/28/2026
The vulnerability identified in PiWeb Disable Payment Method for WooCommerce prior to version 1.1.10.9 represents a critical failure in access control mechanisms within the plugin's AJAX handler functionality. Specifically, the update_fees endpoint lacks proper authorization checks, allowing unauthenticated users to interact with sensitive administrative or customer-specific operations without valid credentials. This architectural flaw enables attackers to bypass standard security protocols that typically restrict such actions to authenticated administrators or verified customers acting on their own data. The absence of server-side validation regarding user permissions transforms a routine fee recalculation feature into a vector for unauthorized data manipulation and disclosure, fundamentally undermining the integrity of the e-commerce platform's order management system.
From a technical perspective, the exploitation mechanism relies on the reuse of nonces from legitimate client sessions combined with sequential enumeration of order identifiers. An attacker can extract a valid nonce from their own order payment page and utilize it to craft requests targeting other customers' orders by iterating through sequential order_id values. This technique exploits the predictable nature of database primary keys in many WordPress installations, allowing for efficient brute-force or sequential access attempts. By supplying these crafted requests to the vulnerable update_fees handler, an attacker can modify payment methods associated with victim accounts and trigger fee recalculations that may alter financial records. Furthermore, the response data returned by this endpoint includes sensitive order details such as line items and total amounts, facilitating comprehensive information disclosure without requiring direct database access or SQL injection techniques.
The operational impact of this vulnerability is severe, affecting both customer privacy and business integrity. Unauthorized modification of payment methods can lead to fraudulent transactions where attackers redirect payments to their own accounts or alter transaction statuses for malicious purposes. The ability to read other customers' order details constitutes a significant breach of confidentiality, exposing personally identifiable information and purchase history in violation of data protection regulations such as GDPR or CCPA. Additionally, the manipulation of fees and totals can disrupt financial reporting accuracy and potentially cause revenue loss if fraudulent adjustments are processed successfully. This level of access erosion allows an unauthenticated actor to effectively impersonate legitimate users within specific operational contexts, compromising trust in the platform's security posture.
In terms of industry classification standards, this vulnerability aligns with CWE-862 Missing Authorization, as the application fails to enforce proper checks on user privileges before executing sensitive actions. It also relates closely to CWE-359 Exposure of Private Personal Information to an Unauthorized Actor due to the disclosure of order details and financial totals. From a tactical perspective within the MITRE ATT&CK framework for enterprise security, this behavior corresponds to T1078 Valid Accounts if the attacker leverages stolen credentials, but more accurately reflects unauthorized access patterns associated with improper privilege management often seen in web application attacks like those categorized under OWASP Top 10 A01 Broken Access Control. The sequential enumeration of resources also touches upon aspects of information gathering and discovery typically monitored by advanced threat detection systems.
Mitigation strategies must prioritize immediate patching to version 1.1.10.9 or later, where the authorization checks for the update_fees AJAX handler have been properly implemented. Until an upgrade is feasible, administrators should consider restricting access to WordPress admin-ajax.php through web application firewall rules that limit POST requests from unauthenticated sources unless they are part of known public-facing forms like login or checkout pages which do not involve sensitive order manipulation. Implementing rate limiting on AJAX endpoints can also mitigate the effectiveness of sequential enumeration attacks by detecting and blocking rapid-fire requests targeting multiple order IDs. Additionally, ensuring that nonces are strictly bound to specific user sessions and actions rather than being reusable across different contexts would further harden the application against this type of exploitation. Regular security audits focusing on input validation and permission verification for all AJAX handlers are essential to prevent similar vulnerabilities in future updates or custom code integrations within the WooCommerce ecosystem.