CVE-2026-89195 in Site Setup Wizard Plugin
Summary
by MITRE • 10/11/2026
The Site Setup Wizard WordPress plugin through 1.5.8 does not properly sanitise and escape a parameter before using it in a SQL statement, which allows unauthenticated attackers to perform SQL injection attacks and read data from the database.
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Analysis
by VulDB Data Team • 10/11/2026
The vulnerability identified within the Site Setup Wizard WordPress plugin versions up to 1.5.8 represents a critical security flaw rooted in insufficient input validation and output encoding mechanisms. Specifically, the application fails to properly sanitize or escape user-supplied parameters prior to their incorporation into SQL query structures. This architectural oversight creates a direct pathway for unauthenticated attackers to manipulate database queries by injecting malicious SQL code through various entry points exposed by the plugin. The absence of robust parameterization or strict whitelisting allows external inputs to be interpreted as executable commands rather than static data, fundamentally breaking the separation between application logic and data storage layers.
From a technical perspective, this flaw aligns with Common Weakness Enumeration identifier CWE-89, which classifies improper neutralization of special elements used in an SQL command, commonly known as SQL injection. The vulnerability is particularly severe because it does not require any form of authentication or user interaction beyond accessing the vulnerable endpoint. Attackers can exploit this by crafting specific HTTP requests that contain specially formatted payloads designed to alter the logic of backend database queries. This capability enables the extraction of sensitive information stored within the WordPress database, including administrator credentials, user details, and potentially site configuration data that could facilitate further compromise of the hosting environment.
The operational impact of this vulnerability extends beyond simple data exfiltration. By leveraging SQL injection techniques such as UNION-based attacks or blind boolean-based inference, an attacker can systematically enumerate database schema structures and retrieve arbitrary rows from any table accessible by the database user account running the web application. This level of access effectively grants full control over the underlying data store. In many WordPress deployments, the database user possesses broad privileges that may extend to file system operations if specific SQL functions are enabled on the server, potentially allowing for remote code execution or defacement of the website through direct write operations.
This vulnerability is categorized under MITRE ATT&CK technique T1059, specifically Command and Scripting Interpreter sub-techniques related to database commands, as it involves the indirect execution of system-level instructions via the database interface. The lack of authentication requirements places this exploit in a high-risk category within threat modeling frameworks, as it can be automated by widespread scanning tools without any prior reconnaissance or credential acquisition phase. This significantly increases the likelihood of successful exploitation against unpatched instances across the internet.
To mitigate this risk, immediate action is required to update the Site Setup Wizard plugin to version 1.5.9 or later where these sanitization and escaping mechanisms have been corrected. Developers should ensure that all database interactions utilize prepared statements with parameterized queries rather than string concatenation for building SQL commands. This approach ensures that user input is treated strictly as data, preventing it from being interpreted as part of the query structure. Additionally, implementing a Web Application Firewall can provide an additional layer of defense by detecting and blocking known SQL injection patterns in incoming traffic until patches are fully deployed across all affected instances. Regular security audits and static code analysis tools should be employed to identify similar vulnerabilities in other plugins or custom themes that may share this architectural weakness.