CVE-2026-81277 in Suggestion Engine Plugin
Summary
by MITRE • 08/27/2026
Contributor SQL Injection in Suggestion Engine for WooCommerce <= 2.0.11 versions.
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Analysis
by VulDB Data Team • 08/27/2026
The vulnerability identified as Contributor SQL Injection in the Suggestion Engine for WooCommerce prior to version 2.0.11 represents a critical security flaw within the plugin's data handling mechanisms, specifically affecting users running outdated iterations of this widely deployed e-commerce extension. This issue stems from insufficient input validation and sanitization processes applied to user-supplied parameters before they are incorporated into database queries executed by the WordPress backend. The Suggestion Engine is designed to provide autocomplete functionality for product searches or other dynamic content, requiring it to process various inputs such as search terms, category filters, or contributor identifiers submitted via HTTP requests. When these inputs are not properly escaped using prepared statements or secure query construction methods, they become susceptible to manipulation by malicious actors seeking to inject arbitrary Structured Query Language code into the application's database interactions.
From a technical perspective, this flaw aligns with CWE-89 Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. The vulnerability allows an attacker to interfere with the queries that an application makes to its database by inserting malicious SQL statements through input fields managed by the Suggestion Engine. Because WooCommerce plugins typically operate within a WordPress environment where user roles and capabilities are strictly defined, this specific vector likely targets parameters accessible to lower-privileged users or even unauthenticated visitors depending on how the suggestion endpoint is configured. The lack of proper parameterization means that special characters such as single quotes can break out of their intended string context, allowing subsequent SQL commands to be executed with the privileges of the database user account running the web application.
The operational impact of this vulnerability extends beyond simple data leakage and encompasses significant risks to system integrity and availability. An attacker exploiting this flaw could potentially read sensitive information from the WordPress database, including administrator usernames, hashed passwords, API keys, customer personal identifiable information, and transactional records stored in WooCommerce tables. Furthermore, depending on the specific configuration of the underlying MySQL or MariaDB server, an advanced exploitation might allow for write operations, such as modifying existing data or inserting new malicious entries, which could lead to defacement or further compromise of the web application's logic. In severe cases, if the database user has elevated privileges and certain functions are enabled, this vulnerability could theoretically be leveraged to execute operating system commands on the server hosting the WordPress instance, leading to a complete takeover of the infrastructure.
This type of attack is categorized under MITRE ATT&CK technique T1059 Command and Scripting Interpreter when considering the broader context of post-exploitation activities enabled by database access, specifically within sub-techniques related to SQL commands for data exfiltration or modification such as T1213 Data from Information Repositories. The exploitation typically occurs during normal user interactions where a request is sent to the suggestion endpoint with crafted parameters designed to trigger error-based blind injection or time-based blind injection techniques if direct output is not visible in the response body. This makes detection difficult without comprehensive logging and monitoring of database query patterns for anomalous behavior indicative of SQLi attempts.
To mitigate this vulnerability, immediate action must be taken by upgrading the Suggestion Engine plugin to version 2.0.11 or later, where the developers have implemented proper input sanitization and output escaping mechanisms consistent with WordPress coding standards. Administrators should ensure that all plugins are kept up-to-date through automated update processes whenever possible to reduce the window of exposure to known vulnerabilities. Additionally, implementing a Web Application Firewall can provide an additional layer of defense by filtering out malicious SQL patterns in HTTP requests before they reach the application logic. Database users running WordPress installations should adhere to the principle of least privilege, ensuring that the database account used by the web application does not have unnecessary permissions such as FILE or SUPER privileges, thereby limiting the potential damage even if a successful injection occurs. Regular security audits and penetration testing focused on input validation across all custom code and third-party plugins are essential practices for maintaining robust e-commerce security postures.