CVE-2006-5720 in PHP-Nuke
Summary
by MITRE
SQL injection vulnerability in modules/journal/search.php in the Journal module in Francisco Burzi PHP-Nuke 7.9 and earlier allows remote attackers to execute arbitrary SQL commands via the forwhat parameter.
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Analysis
by VulDB Data Team • 04/26/2026
The vulnerability identified as CVE-2006-5720 represents a critical SQL injection flaw within the Journal module of PHP-Nuke version 7.9 and earlier. This security weakness resides in the modules/journal/search.php script where user input is improperly handled, creating an avenue for malicious actors to manipulate database queries through the forwhat parameter. The vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly escape or filter user-supplied data before incorporating it into SQL command structures. Attackers can exploit this flaw by crafting malicious input that alters the intended database query execution flow, potentially gaining unauthorized access to sensitive information or executing destructive operations against the underlying database system.
The technical exploitation of this vulnerability aligns with CWE-89, which categorizes SQL injection as a fundamental weakness in application security where untrusted data is directly incorporated into SQL queries without proper sanitization. This flaw operates at the application layer and demonstrates how insufficient parameter validation can create persistent security risks within content management systems. The vulnerability affects the Journal module specifically, which is part of the broader PHP-Nuke framework that was widely deployed in web applications during the mid-2000s era. The forwhat parameter serves as the primary attack vector, allowing remote threat actors to inject malicious SQL code that bypasses normal authentication and authorization controls. This type of attack can be classified under the ATT&CK technique T1071.004 for application layer protocol manipulation, where adversaries exploit weaknesses in application code to manipulate database interactions.
The operational impact of this vulnerability extends beyond simple data theft, as it can enable attackers to execute arbitrary SQL commands with the privileges of the database user account. This capability allows for complete database compromise including data exfiltration, data modification, or even complete system takeover depending on the database permissions. The vulnerability's remote nature means that attackers do not require local system access or physical presence to exploit the flaw, making it particularly dangerous for web applications. Organizations running affected PHP-Nuke versions face significant risk of unauthorized data access, potential service disruption, and compliance violations if sensitive information is compromised through this attack vector. The vulnerability also demonstrates how legacy systems often contain unpatched security flaws that remain exploitable for years after initial discovery, highlighting the importance of regular security assessments and timely patch management.
Mitigation strategies for CVE-2006-5720 require immediate action to address the root cause through proper input validation and parameter sanitization. The most effective approach involves implementing prepared statements or parameterized queries that separate SQL command structure from user data, ensuring that malicious input cannot alter the intended query execution. Organizations should also implement proper input filtering and sanitization routines that validate and escape all user-supplied parameters before database processing. Additionally, access controls should be implemented to limit database permissions for web applications, following the principle of least privilege to minimize potential damage from successful exploitation attempts. The remediation process should include immediate patching of affected PHP-Nuke installations to version 8.0 or later, where this vulnerability has been addressed through improved input validation and sanitization mechanisms. Security monitoring should also be enhanced to detect unusual database query patterns that might indicate exploitation attempts, and regular security audits should be conducted to identify similar vulnerabilities in other application components.