CVE-2006-5306 in Journals System module
Summary
by MITRE
Multiple PHP remote file inclusion vulnerabilities in the Journals System module 1.0.2 (RC2) and earlier for phpBB allow remote attackers to execute arbitrary PHP code via a URL in the phpbb_root_path parameter in (1) includes/journals_delete.php, (2) includes/journals_post.php, or (3) includes/journals_edit.php.
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Analysis
by VulDB Data Team • 04/24/2026
The CVE-2006-5306 vulnerability represents a critical remote file inclusion flaw affecting the Journals System module version 1.0.2 (RC2) and earlier within the phpBB platform. This vulnerability resides in the module's handling of user-supplied input through the phpbb_root_path parameter, which is processed in three specific files including journals_delete.php, journals_post.php, and journals_edit.php. The flaw allows malicious actors to inject arbitrary PHP code by manipulating the URL parameter, effectively bypassing normal input validation mechanisms and creating a direct pathway for remote code execution.
The technical exploitation of this vulnerability stems from improper input sanitization and validation within the phpBB module's codebase. When the application processes the phpbb_root_path parameter without adequate filtering or validation, it becomes susceptible to malicious input that can be interpreted as a valid file path. This creates a condition where an attacker can inject a remote URL containing malicious PHP code, which then gets executed by the web server when the vulnerable script processes the parameter. The vulnerability aligns with CWE-94, which describes improper control of generation of code, specifically indicating a weakness where the application does not properly validate or sanitize inputs that are used to construct code or file paths.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with complete control over the affected phpBB installation. Successful exploitation enables adversaries to execute arbitrary commands on the web server, potentially leading to full system compromise, data exfiltration, or the establishment of persistent backdoors. The vulnerability affects the core functionality of the Journals System module, which is designed to handle user-generated content and journal entries, making it particularly dangerous as it can be exploited through normal user interaction with the forum's features. Attackers can leverage this vulnerability to upload malware, modify database contents, or even gain shell access to the underlying server infrastructure.
Security practitioners should implement multiple layers of mitigation for this vulnerability, beginning with immediate patching of the affected phpBB modules to version 1.0.3 or later where the vulnerability has been addressed. Network-based mitigations include implementing proper input validation at the web application firewall level, blocking suspicious URL patterns, and monitoring for unusual file inclusion requests. The principle of least privilege should be enforced by ensuring that the web server operates with minimal required permissions and that the affected modules are properly configured to prevent external URL inclusion. Additionally, administrators should conduct thorough security audits of phpBB installations to identify and remediate similar vulnerabilities in other modules or custom extensions that may exhibit similar patterns of insecure parameter handling. This vulnerability demonstrates the critical importance of input validation and the potential for remote code execution when user-supplied data is not properly sanitized before being processed by web applications, aligning with ATT&CK technique T1059.007 for command and script injection.