CVE-2026-111032 in Welcart e-Commerce Plugin
Summary
by MITRE • 10/28/2026
The Welcart e-Commerce WordPress plugin before 2.12.6 does not properly verify authorization against the targeted product before processing SKU changes, because its capability check is not tied to the product being edited, allowing any authenticated user with Author-level access or higher to read, modify, create, delete and re-order the SKU data (including prices, confidential cost prices and stock levels) of any product, including those belonging to other users.
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Analysis
by VulDB Data Team • 10/28/2026
The vulnerability identified in Welcart e-Commerce for WordPress prior to version 2.12.6 represents a critical failure in server-side access control mechanisms within the plugin's administrative interface. This flaw stems from an improper verification of authorization scopes when processing requests related to product data modifications, specifically focusing on Stock Keeping Unit (SKU) updates. In secure web application architecture, every action that modifies stateful resources must be validated against both the user's role permissions and their specific ownership or access rights to the targeted resource. However, in this implementation, while the system correctly checks if a user possesses sufficient general privileges such as Author-level access or higher, it fails to bind these capabilities to the specific product ID being edited. This architectural oversight creates a Broken Access Control scenario where the application logic assumes that any authenticated user with elevated roles has unrestricted authority over all products in the database rather than limiting their scope to items they are explicitly permitted to manage.
From a technical perspective, this deficiency allows for Insecure Direct Object Reference (IDOR) attacks against product records. An attacker who is authenticated as an Author or higher can manipulate HTTP requests targeting specific product identifiers without any additional validation checks ensuring that the requesting user owns those products. By altering parameters in API calls or form submissions associated with SKU changes, malicious actors can read sensitive inventory data, modify pricing structures, alter stock levels, and even delete existing entries for products owned by other users or administrators. The ability to change SKUs is particularly dangerous because it directly impacts operational integrity; attackers can disrupt supply chain logistics by falsifying stock counts, cause financial loss through unauthorized price adjustments, or steal confidential cost prices that are typically hidden from lower-level staff but were inadvertently exposed due to the lack of object-specific authorization checks.
The impact of this vulnerability extends beyond simple data leakage into significant business disruption and potential regulatory non-compliance. Since SKU data often includes confidential cost prices alongside retail pricing and inventory levels, its exposure violates principles of confidentiality essential for maintaining competitive advantage and protecting proprietary business information. Furthermore, the ability to delete or reorder SKUs can lead to operational chaos within the e-commerce platform, potentially causing order fulfillment errors, stock discrepancies, and customer dissatisfaction. This aligns with CWE-284 Improper Access Control and CWE-639 Authorization Bypass Through User-Controlled Key, highlighting a fundamental flaw in how identity and access management are enforced at the application logic layer rather than just through role-based access control lists.
To mitigate this risk, immediate action is required to upgrade the Welcart e-Commerce plugin to version 2.12.6 or later where these authorization checks have been corrected to properly tie capabilities to specific product entities. In environments where patching cannot be implemented instantly, administrators should enforce strict role-based access control by limiting Author-level privileges only to users who genuinely require broad editing rights and ensuring that no unnecessary administrative functions are exposed to lower-tier accounts. Additionally, implementing server-side validation logic that explicitly verifies the ownership or permission status of a user against every product ID referenced in modification requests is essential for preventing similar vulnerabilities across other plugins or custom code within the WordPress ecosystem. This approach ensures compliance with security best practices and mitigates the risk associated with ATT&CK technique T1078 Valid Accounts, where attackers leverage legitimate credentials to perform unauthorized actions due to insufficient access control enforcement.