CVE-2026-66668 in Community Plugin
Summary
by MITRE • 08/19/2026
Subscriber SQL Injection in Community by PeepSo <= 9.0.5.2 versions.
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Analysis
by VulDB Data Team • 08/19/2026
The vulnerability identified as a subscriber SQL injection flaw within the Community plugin for WordPress, specifically affecting versions up to and including 9.0.5.2, represents a critical security risk that compromises the integrity of the underlying database infrastructure. This plugin is widely utilized by website owners to create social networking features such as user profiles, activity streams, and community forums. The presence of this vulnerability indicates a fundamental failure in input validation and sanitization processes within the application code, allowing untrusted data from subscribers or other users to be improperly handled during SQL query construction.
The technical root cause lies in the insufficient filtering of user-supplied input before it is incorporated into database queries. In typical web applications, parameters passed via HTTP requests such as GET or POST variables must be strictly validated against expected formats and types. However, in this specific instance, the application fails to properly escape special characters or utilize prepared statements with parameterized queries for certain subscriber-related operations. This oversight allows an attacker to inject malicious SQL code into these input fields. When the database processes these inputs, it interprets the injected commands as part of the original query structure rather than as literal data values.
This architectural flaw enables a range of severe operational impacts beyond simple data leakage. An authenticated or unauthenticated attacker can exploit this injection point to perform unauthorized read operations, extracting sensitive information such as administrator usernames and password hashes stored in the wp_users table. Furthermore, depending on the database configuration and privileges granted to the web application's database user, an attacker may execute write operations, modify existing records, or even drop tables entirely. In more advanced scenarios involving specific database engines like MySQL with certain configurations, this vulnerability could potentially be leveraged for server-side request forgery or remote code execution through out-of-band techniques such as blind SQL injection using time-based delays to infer data character by character.
From a classification perspective, this issue aligns directly with CWE-89 Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. It also maps to the MITRE ATT&CK framework under technique T1059 Command and Scripting Interpreter if the injection leads to further system compromise, or more accurately T1190 Exploit Public-Facing Application for initial access and data exfiltration. The vulnerability highlights a common pattern in legacy or poorly maintained WordPress plugins where security best practices such as using the $wpdb->prepare method are neglected in favor of direct string concatenation when building SQL statements.
Mitigation strategies must be implemented immediately to address this critical flaw. Site administrators should upgrade the Community plugin by PeepSo to version 9.0.5.3 or any later release where the developer has patched these input validation gaps. If upgrading is not immediately feasible, temporary mitigations include implementing a Web Application Firewall that can detect and block common SQL injection patterns in HTTP requests. Additionally, database users should be configured with the principle of least privilege to limit the potential damage if an injection succeeds. Regular security audits and code reviews focusing on data handling practices are essential to prevent similar vulnerabilities from persisting in web applications built on PHP and MySQL architectures.