NodeBB Vulnerability Let Attackers Inject Boolean-Based Blind and PostgreSQL Error-Based Payloads

NodeBB, a widely utilized open-source forum platform, has been identified as having a critical vulnerability in its version 4.3.0. This flaw, designated as CVE-2025-50979, is located within the search-categories API endpoint. It permits unauthenticated remote attackers to execute both boolean-based blind and PostgreSQL error-based SQL injection attacks.

The implications of this vulnerability are significant, as successful exploitation could result in unauthorized access to sensitive data, potential information disclosure, or even further compromise of the system.

Key Takeaways
1. NodeBB v4.3.0’s unsanitized search parameter allows unauthenticated SQL injection.
2. Exploits include Boolean-based blind and PostgreSQL error-based payloads.
3. Upgrade or use WAF rules, IP restrictions, and log monitoring.

SQL Injection Vulnerability

In the affected version of NodeBB, the search parameter within the search-categories API is inadequately sanitized before being integrated into the SQL query builder. This oversight allows for the injection of specially crafted payloads that can manipulate the intended logic of SQL statements. Two proof-of-concept payloads illustrate the vulnerability’s severity:

Boolean-Based Blind Injection:

This payload introduces the condition AND 4638=4638 into the WHERE clause, which consistently evaluates to true, demonstrating that an attacker can influence conditional logic.

PostgreSQL Error-Based Injection:

This payload triggers a casting error in PostgreSQL, revealing the success of the attack through database error messages that contain injected markers.

Mitigations

Exploitation of CVE-2025-50979 allows attackers to read or modify sensitive data, escalate privileges within the forum, and execute arbitrary SQL commands. Publicly accessible NodeBB instances are particularly vulnerable, especially those lacking stringent firewall configurations or operating behind permissive reverse proxies.

To address this issue, NodeBB maintainers have released a patch in version 4.3.1, which effectively escapes and parameterizes the search input. Administrators are strongly encouraged to upgrade without delay. For those unable to implement the upgrade immediately, several temporary mitigations can be employed:

• Implement a Web Application Firewall (WAF) rule to block requests that contain SQL meta-characters.
• Restrict API access to trusted IP ranges through network ACLs or proxy configurations.
• Monitor logs for any suspicious patterns in the search parameter.

This vulnerability highlights the critical need for proper input sanitization and the use of prepared statements for all SQL interactions. Continuous vigilance and timely updates are essential to safeguard community platforms like NodeBB against increasingly sophisticated injection attacks.

Find this Story Interesting! Follow us on LinkedIn and X to Get More Instant Updates.