CVE-2026-93508 in WC Fields Factory Plugin
Summary
by MITRE • 09/23/2026
The WC Fields Factory WordPress plugin before 4.1.11 does not properly restrict access to its field-management AJAX action, allowing authenticated users with Subscriber-level access and above to create, modify and delete arbitrary post meta on any post, including WooCommerce products, regardless of ownership, and to manipulate stored pricing rules on a product to reduce its checkout price.
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Analysis
by VulDB Data Team • 09/23/2026
The vulnerability identified in the WC Fields Factory WordPress plugin prior to version 4.1.11 represents a critical failure in server-side access control mechanisms within an AJAX endpoint designed for field management. This flaw allows authenticated users, even those with minimal privileges such as Subscriber-level access and above, to bypass intended restrictions on data manipulation. The core technical issue lies in the improper validation of user capabilities against specific post ownership or administrative roles when processing requests that modify arbitrary post meta fields. By exploiting this lack of authorization checks, an attacker can interact directly with the plugin's AJAX action handler to inject, alter, or remove metadata associated with any post within the WordPress database environment. This capability extends beyond standard content editing and impacts critical e-commerce data structures managed by WooCommerce, specifically targeting product configurations and pricing logic stored in custom meta fields.
From a technical perspective, this vulnerability is classified under CWE-269, which denotes Improper Privilege Control, as it allows lower-privileged users to perform actions reserved for higher-privileged roles or administrators without adequate verification of their authority relative to the target resource. Furthermore, because the attack vector involves sending crafted requests via AJAX after successful authentication, it aligns with ATT&CK technique T1078, Valid Accounts, where adversaries leverage legitimate credentials to gain unauthorized access and manipulate system configurations. The ability to modify arbitrary post meta means that an attacker is not limited to visual changes but can fundamentally alter the underlying data model of the website's content management system. This includes modifying metadata fields that dictate product attributes, inventory levels, or more critically, pricing rules embedded within WooCommerce products.
The operational impact of this vulnerability is severe for any e-commerce site utilizing WC Fields Factory and WooCommerce. An attacker with subscriber-level access can manipulate stored pricing rules on a product to artificially reduce its checkout price. This capability enables direct financial fraud through the purchase of goods at significantly discounted or zero cost, leading to immediate revenue loss and potential inventory depletion if not monitored closely. Beyond financial theft, the ability to delete arbitrary post meta poses a risk of data integrity compromise and service disruption. If critical metadata required for product functionality is removed, it may cause frontend errors, broken checkout processes, or inconsistent display of product information, thereby degrading user experience and trust in the platform. The lack of ownership checks means that any authenticated user can target high-value products managed by administrators, making this a widespread threat across multi-user WordPress installations where even basic subscriber accounts are granted access to view content.
Mitigation strategies must prioritize immediate software updates as the primary defense vector. Administrators should upgrade WC Fields Factory to version 4.1.11 or later, which addresses these authorization flaws by implementing strict capability checks that verify both user role and resource ownership before allowing meta modifications. In environments where updating is not immediately feasible, temporary mitigations include restricting access to WordPress admin areas using IP whitelisting for administrative endpoints if possible, although this does not fully secure AJAX actions accessible from the frontend. Additionally, deploying a Web Application Firewall with rules that detect anomalous patterns in post meta updates initiated by low-privilege users can provide an additional layer of defense. Regular auditing of user roles and permissions is also recommended to ensure that only necessary accounts have access to areas where such vulnerabilities could be exploited, thereby reducing the attack surface available to potential adversaries seeking to manipulate e-commerce data integrity.