CVE-2026-45440 in WP Ultimate CSV Importer Plugin
Summary
by MITRE • 10/10/2026
Administrator SQL Injection in WP Ultimate CSV Importer <= 9.2 versions.
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Analysis
by VulDB Data Team • 10/10/2026
The vulnerability identified as an administrator-level SQL injection flaw within the WP Ultimate CSV Importer plugin, affecting version 9.2 and earlier releases, represents a critical security deficiency that compromises the integrity of WordPress-based web applications. This specific class of vulnerability arises from inadequate input validation and sanitization mechanisms when processing user-supplied data during administrative operations. Unlike lower-privilege injection vectors that might be exploitable by unauthenticated attackers or low-level contributors, this flaw requires authentication as an administrator to trigger. While this access requirement raises the barrier for initial exploitation compared to public-facing vulnerabilities, it remains highly dangerous because administrators often possess elevated privileges and broad access to sensitive site data, including database contents, user credentials, and configuration files. The presence of such a vulnerability in widely used plugins underscores the persistent risk associated with third-party code that may not adhere strictly to secure coding standards or undergo rigorous security auditing before release.
From a technical perspective, the root cause lies in the construction of SQL queries where input parameters derived from CSV import operations are directly concatenated into database statements without proper escaping or parameterization. When an administrator uploads a CSV file containing maliciously crafted data fields, these inputs can be interpreted as executable SQL code by the backend database engine rather than treated strictly as literal string values. This allows for the manipulation of query logic, enabling attackers to bypass authentication checks, extract sensitive information from other tables via union-based techniques, or modify and delete existing records through blind injection methods. The lack of prepared statements or robust input filtering mechanisms leaves the application vulnerable to standard SQLi payloads that can exploit syntax errors or logical flaws in how the plugin processes imported data structures. This aligns with CWE-89, which classifies improper neutralization of special elements used in an SQL command, highlighting a fundamental failure in implementing secure database interaction patterns such as parameterized queries.
The operational impact of this vulnerability is severe due to the high privilege level required for exploitation and the potential scope of data exposure. An authenticated attacker with administrator access can leverage this flaw to perform unauthorized actions that compromise the entire website ecosystem. This includes exfiltrating user passwords, session tokens, API keys, and other confidential information stored in the WordPress database. Furthermore, depending on the underlying database configuration and server permissions, successful exploitation could potentially lead to remote code execution if the attacker is able to write shell files or manipulate system-level functions through out-of-band data channels like LOAD_FILE or INTO OUTFILE statements in MySQL environments. This level of compromise effectively grants full control over the web application, allowing for defacement, installation of backdoors, and use as a pivot point for further attacks against internal network resources. The risk is exacerbated by the fact that many organizations rely on automated import processes managed by administrators who may not be fully aware of security implications when handling external data sources.
In terms of threat modeling and industry frameworks, this vulnerability maps to MITRE ATT&CK technique T1059.004, which covers command and script interpretation via SQL injection, specifically within the context of lateral movement or credential dumping phases if used for reconnaissance. It also relates to CWE-621 regarding extraction of data through error-based methods if the application reveals database errors in response to malformed inputs. The severity is compounded by the fact that WordPress plugins are often deployed across millions of sites with varying levels of security hygiene, making widespread exploitation feasible once a proof-of-concept is published or sold on underground markets. Organizations must recognize that even internal-facing vulnerabilities accessible only to trusted users can be exploited through social engineering attacks where an attacker tricks an administrator into importing maliciously crafted files, thereby bypassing the authentication requirement indirectly.
Mitigation strategies for this vulnerability prioritize immediate remediation and long-term security hardening practices. The most effective solution is to upgrade the WP Ultimate CSV Importer plugin to a version newer than 9.2, as developers typically release patches that address known SQL injection flaws by implementing proper input sanitization and using prepared statements with parameterized queries. Until an update is available, administrators should restrict access to the WordPress dashboard through strong authentication methods such as multi-factor authentication and IP whitelisting to reduce the attack surface for authenticated users. Additionally, deploying a Web Application Firewall can help detect and block common SQL injection patterns in HTTP requests, although this serves only as a compensating control rather than a fix. Regular security audits of installed plugins, adherence to secure coding guidelines like those from OWASP, and minimizing the number of active third-party extensions are essential steps to reduce overall vulnerability exposure. Monitoring database logs for anomalous query patterns can also aid in early detection of exploitation attempts, ensuring that any breach is identified before significant damage occurs.