CVE-2025-67616: Mella Theme Path Traversal Vulnerability

CVE-2025-67616 Overview

CVE-2025-67616 is a Local File Inclusion (LFI) vulnerability affecting the Mella WordPress theme developed by BZOTheme. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files from the server filesystem.

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program), which describes scenarios where PHP applications fail to properly validate or sanitize file paths before including them in the application's execution flow.

Critical Impact

Successful exploitation could allow attackers to read sensitive configuration files, access credentials stored on the server, or potentially achieve remote code execution by combining LFI with other attack techniques such as log poisoning.

Affected Products

• BZOTheme Mella WordPress Theme versions up to and including 1.2.29
• WordPress installations using the vulnerable Mella theme
• Web servers hosting WordPress sites with the affected theme installed

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-67616 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-67616

Vulnerability Analysis

The Mella WordPress theme contains a PHP Local File Inclusion vulnerability that allows attackers to manipulate file path parameters used in PHP's include() or require() statements. When user-controlled input is passed to these functions without proper validation, attackers can traverse directory structures and include files that were not intended to be accessible.

Local File Inclusion vulnerabilities in WordPress themes are particularly dangerous because WordPress installations often contain sensitive files such as wp-config.php, which stores database credentials and authentication keys. Additionally, attackers may leverage LFI to read server logs, session files, or other sensitive data that could facilitate further attacks.

Root Cause

The root cause of this vulnerability is inadequate input validation and sanitization of file path parameters before they are used in PHP include/require statements. The Mella theme fails to properly restrict which files can be included, allowing path traversal sequences (such as ../) to escape the intended directory context.

PHP applications should implement strict allowlisting of includable files and sanitize all user input to prevent directory traversal attacks. The absence of these controls in affected versions of the Mella theme creates the vulnerable condition.

Attack Vector

The attack vector involves manipulating URL parameters or POST data that the theme uses to determine which files to include. An attacker can craft malicious requests containing path traversal sequences to include arbitrary files from the server's filesystem.

Common exploitation scenarios include:

• Reading the WordPress configuration file (wp-config.php) to obtain database credentials
• Accessing /etc/passwd or similar system files to enumerate users
• Reading PHP session files to hijack user sessions
• Combining with log poisoning to achieve remote code execution

For detailed technical information about this vulnerability, refer to the Patchstack Mella Theme Vulnerability advisory.

Detection Methods for CVE-2025-67616

Indicators of Compromise

• Unusual HTTP requests containing path traversal patterns such as ../, ..%2f, or encoded variants targeting Mella theme files
• Web server logs showing attempts to access sensitive files like wp-config.php, /etc/passwd, or system log files through theme parameters
• Unexpected file read operations originating from the Mella theme directory
• Evidence of configuration file access or credential exfiltration in security logs

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in requests to the Mella theme endpoints
• Monitor web server access logs for suspicious requests containing directory traversal sequences targeting theme files
• Deploy file integrity monitoring to detect unauthorized reads of sensitive configuration files
• Configure intrusion detection systems to alert on LFI attack patterns

Monitoring Recommendations

• Enable detailed logging for WordPress and PHP applications to capture file inclusion attempts
• Set up real-time alerting for requests containing known path traversal patterns targeting WordPress themes
• Monitor network traffic for data exfiltration patterns following potential LFI exploitation
• Implement endpoint detection to identify processes reading sensitive configuration files

How to Mitigate CVE-2025-67616

Immediate Actions Required

• Update the Mella WordPress theme to a patched version if available from BZOTheme
• If no patch is available, consider temporarily disabling or replacing the Mella theme with an alternative
• Implement Web Application Firewall rules to block path traversal attempts
• Audit server logs for signs of exploitation attempts against this vulnerability
• Review and restrict file system permissions on sensitive WordPress configuration files

Patch Information

Check the Patchstack vulnerability database for the latest patch status and update instructions from BZOTheme. Ensure you are running a version newer than 1.2.29 once a patched release becomes available.

Workarounds

• Implement strict input validation on the web server level using ModSecurity or similar WAF solutions
• Configure PHP open_basedir to restrict file access to the WordPress installation directory
• Apply the principle of least privilege to filesystem permissions, ensuring the web server user cannot read files outside the required scope
• Consider using WordPress security plugins that provide virtual patching capabilities for vulnerable themes

# Example: Restrict PHP file access using open_basedir in php.ini
open_basedir = /var/www/html/wordpress:/tmp

# Example: ModSecurity rule to block path traversal attempts
SecRule REQUEST_URI "\.\./" "id:1000,phase:1,deny,status:403,msg:'Path traversal attempt blocked'"