CVE-2026-111027 in Welcart E-Commerce Plugin
Summary
by MITRE • 10/28/2026
The Welcart e-Commerce WordPress plugin before 2.12.6 does not properly sanitise and escape a parameter before using it in a SQL query, and strips the escaping it had applied before running the query, allowing users with the Editor role or higher to perform SQL injection attacks.
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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 security flaw rooted in improper input validation and output encoding practices within the application's database interaction layer. This specific issue manifests as an Unrestricted Upload of Functionality with Default Identifiable Weaknesses, but more accurately classified under Injection flaws where user-controllable data is not sufficiently sanitized before being incorporated into SQL commands. The core technical failure lies in the plugin's handling of parameters passed to backend queries. Instead of maintaining strict separation between code and data, the software applies escaping mechanisms that are subsequently stripped or overridden prior to query execution. This logical error effectively neutralizes any protective measures intended by earlier sanitization steps, leaving the database interface exposed to maliciously crafted input strings designed to alter the structure of SQL statements executed against the backend system.
From a technical perspective, this flaw allows authenticated users possessing at least the Editor role or higher privileges to exploit the injection point. In WordPress environments, such roles typically have significant access levels including the ability to manage posts, media, and plugins, which lowers the barrier for exploitation compared to unauthenticated attacks. The attacker can inject arbitrary SQL commands that are then executed by the database server with the same permissions as the web application itself. This capability enables a range of malicious activities beyond simple data exfiltration, including modification or deletion of existing records within the WordPress database and potentially gaining control over critical site configurations. The stripping of escaping suggests a flaw in how the plugin processes variables through multiple layers of abstraction without ensuring that final execution contexts respect those safety constraints, creating a classic blind SQL injection vector where the application logic fails to preserve data integrity during query construction.
The operational impact of this vulnerability is severe for any organization relying on Welcart for e-commerce operations. Successful exploitation can lead to unauthorized access to sensitive customer information such as payment details, personal addresses, and order histories stored in the database. Furthermore, attackers may leverage SQL injection to escalate privileges within the WordPress environment, potentially achieving full administrative control over the website. This could result in defacement, installation of web shells for persistent remote access, or use of the compromised server as a pivot point for further attacks against internal networks. The ability to manipulate query logic also poses risks related to data integrity, where financial records or inventory levels can be altered without authorization, directly impacting business continuity and customer trust.
To mitigate this risk, immediate action is required by upgrading the Welcart e-Commerce plugin to version 2.12.6 or later, which addresses these sanitization errors through improved input validation and consistent escaping protocols aligned with WordPress coding standards. Administrators should also ensure that all other plugins and core software components are updated to their latest stable releases to prevent similar vulnerabilities from being exploited in conjunction with this flaw. Implementing a Web Application Firewall can provide an additional layer of defense by filtering out malicious SQL patterns before they reach the application logic, although reliance on WAFs is not a substitute for patching the underlying code vulnerability. Regular security audits and penetration testing focused on input validation mechanisms are recommended to identify similar weaknesses in custom or third-party extensions that interact with database systems.
This incident aligns with Common Weakness Enumeration identifier CWE-89 Improper Neutralization of Special Elements used in an SQL Command, highlighting the necessity for rigorous parameterized query usage rather than string concatenation for dynamic values. It also relates to ATT&CK technique T1059 Command and Scripting Interpreter if exploitation leads to further command execution on the host system via database extensions or stored procedures. Security teams should prioritize patch management workflows that include rapid response capabilities for high-severity vulnerabilities affecting widely used plugins, ensuring that development practices enforce strict separation of data and code throughout the application lifecycle.