CVE-2026-78288 in Beautiful Taxonomy Filters Plugin
Summary
by MITRE • 08/27/2026
Unauthenticated SQL Injection in Beautiful Taxonomy Filters <= 2.4.6 versions.
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Analysis
by VulDB Data Team • 08/27/2026
The vulnerability identified as an unauthenticated SQL injection flaw within the Beautiful Taxonomy Filters plugin, specifically affecting versions up to and including 2.4.6, represents a critical security deficiency that compromises the integrity of WordPress-based websites relying on this extension for taxonomy management. This type of vulnerability arises from inadequate input validation and sanitization mechanisms when processing user-supplied data before it is incorporated into database queries. In the context of web application architecture, SQL injection occurs when an attacker can manipulate backend Structured Query Language statements by injecting malicious code through untrusted inputs such as HTTP parameters, cookies, or headers. Because this specific flaw allows for exploitation without requiring any form of authentication, it significantly lowers the barrier to entry for attackers, enabling anyone with internet access and basic knowledge of SQL injection techniques to exploit the weakness remotely over a network connection.
From a technical perspective, the root cause lies in the failure to properly escape or parameterize user input before its inclusion in an SQL query executed by the underlying database management system. When the plugin processes requests related to taxonomy filtering, it likely constructs dynamic queries using concatenated strings rather than prepared statements with bound parameters. This architectural oversight allows special characters and SQL syntax elements within the input data to alter the logic of the original query. For instance, an attacker might inject a sequence such as UNION SELECT or use boolean-based blind techniques to extract sensitive information from the database schema. The lack of authentication means that these malicious payloads can be delivered via standard HTTP GET or POST requests without needing valid credentials for the WordPress admin dashboard, making the attack vector highly accessible and difficult to detect through traditional access control logs alone.
The operational impact of this vulnerability is severe and multifaceted, primarily centering on unauthorized data disclosure and potential system compromise. Successful exploitation allows an attacker to read arbitrary data from the database, which may include user credentials stored in plaintext or hashed formats, personal identifiable information associated with site users, configuration settings, and other sensitive content managed by the WordPress installation. Beyond simple data exfiltration, advanced SQL injection techniques can potentially lead to remote code execution if the underlying database engine permits file system access commands such as SELECT INTO OUTFILE on MySQL/MariaDB systems or xp_cmdshell on Microsoft SQL Server environments. This could result in full server compromise, allowing attackers to install web shells, deface websites, launch further attacks against internal networks, or use the compromised host for distributed denial-of-service operations and cryptocurrency mining activities.
This vulnerability 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. Furthermore, from a tactical perspective within the MITRE ATT&CK framework, this flaw facilitates techniques associated with Initial Access and Collection phases, specifically leveraging valid credentials or exploiting application vulnerabilities to gain foothold and extract data. The unauthenticated nature of the exploit places it firmly within the realm of high-severity remote code execution risks that are frequently targeted by automated scanning tools and botnets seeking vulnerable WordPress installations for propagation purposes.
Mitigation strategies must prioritize immediate remediation through software updates, as vendors typically release patched versions to address such critical flaws in subsequent releases. Administrators should upgrade Beautiful Taxonomy Filters to the latest version where input sanitization and parameterized queries have been implemented correctly. In cases where updating is not immediately feasible due to compatibility constraints or other operational dependencies, temporary mitigation measures include implementing a Web Application Firewall configured with rulesets specifically tuned to detect SQL injection patterns in HTTP parameters. Additionally, enforcing strict principle of least privilege for database accounts used by the web application can limit the damage an attacker might cause even if exploitation succeeds, such as restricting SELECT permissions on sensitive tables or disabling dangerous functions like LOAD_FILE or INTO OUTFILE at the database configuration level. Regular security audits and code reviews focusing on data handling practices are also essential to prevent recurrence of similar vulnerabilities in custom plugins or themes.