CVE-2026-81293 in Data Access Plugin
Summary
by MITRE • 08/31/2026
Unauthenticated SQL Injection in WP Data Access <= 5.5.81 versions.
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Analysis
by VulDB Data Team • 08/31/2026
The vulnerability identified as an unauthenticated SQL injection flaw within the WP Data Access plugin, specifically affecting versions up to and including 5.5.81, represents a critical security deficiency that compromises the integrity of WordPress-based database interactions. This issue stems from insufficient input validation and sanitization mechanisms when processing user-supplied data before it is incorporated into SQL queries executed against the backend database management system. Because the vulnerability allows for unauthenticated access, any individual on the internet can exploit this flaw without needing valid credentials or a logged-in session with the WordPress administration panel, significantly lowering the barrier to entry for attackers and increasing the likelihood of successful exploitation in automated attack scenarios.
From a technical perspective, the core issue lies in how the plugin constructs dynamic SQL statements based on parameters provided by users through HTTP requests. When these inputs are not properly escaped or parameterized using prepared statements, an attacker can inject malicious SQL code that alters the logic of the original query. This typically involves appending or modifying WHERE clauses to bypass authentication checks, extract sensitive data from other tables, or even execute administrative commands depending on the privileges granted to the database user account running the web application. The lack of strict type checking and context-aware escaping allows special characters such as single quotes, semicolons, and SQL keywords like UNION SELECT to be interpreted by the database engine rather than treated as literal data values.
The operational impact of this vulnerability is severe, potentially leading to full system compromise if the underlying database user has elevated privileges. Attackers can exfiltrate sensitive information including usernames, hashed passwords, API keys, and personal identifiable information stored within the WordPress database. Furthermore, depending on the specific configuration and capabilities enabled in the MySQL or MariaDB instance, such as FILE privilege or xp_cmdshell equivalents, an attacker might achieve remote code execution by writing malicious files to the server's filesystem or executing system commands through the database interface. This transforms a simple data breach into a complete takeover of the web application environment, allowing for defacement, installation of backdoors, and use of the compromised host as part of larger botnets.
This vulnerability aligns with Common Weakness Enumeration (CWE) ID 89, which categorizes Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. In terms of offensive security frameworks, this flaw facilitates techniques described under MITRE ATT&CK tactic T1059, specifically command scripting or database commands, and contributes to the initial access phase by allowing unauthorized data retrieval (T1213) or privilege escalation if combined with other weaknesses. The unauthenticated nature places it firmly within high-risk categories where immediate remediation is required due to the ease of exploitation via automated scanners found in the wild.
Mitigation strategies must prioritize upgrading the WP Data Access plugin to version 5.5.82 or later, which includes patches addressing these input validation deficiencies. Until an upgrade can be performed, administrators should implement a Web Application Firewall (WAF) rule set designed to detect and block common SQL injection patterns in HTTP request parameters targeting the affected endpoints. Additionally, enforcing principle of least privilege for the database user account associated with WordPress is crucial; this involves ensuring that the application-level database user does not possess administrative rights such as FILE or SUPER privileges, thereby limiting the potential damage even if an injection succeeds. Regular security audits and code reviews focusing on dynamic query construction practices are also recommended to prevent similar vulnerabilities in custom plugins or themes.