CVE-2025-39387: Opstore WordPress File Inclusion Flaw

CVE-2025-39387 Overview

CVE-2025-39387 is an Improper Control of Filename for Include/Require Statement in PHP Program vulnerability affecting the wpoperations Opstore WordPress theme. This Local File Inclusion (LFI) vulnerability allows attackers to include arbitrary local files through manipulated file path inputs, potentially leading to sensitive information disclosure or code execution.

Critical Impact

This LFI vulnerability in the Opstore WordPress theme could allow attackers to read sensitive configuration files, access credentials, or achieve remote code execution by including malicious files on the target system.

Affected Products

• Opstore WordPress Theme version 1.4.5 and earlier
• WordPress installations using the Opstore theme

Discovery Timeline

• 2025-04-24 - CVE-2025-39387 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-39387

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Opstore WordPress theme fails to properly validate and sanitize user-supplied input before using it in PHP include or require statements. This allows an attacker to manipulate file paths to include arbitrary local files from the server's filesystem.

Local File Inclusion vulnerabilities are particularly dangerous in PHP applications because they can expose sensitive files such as /etc/passwd, WordPress configuration files (wp-config.php), or log files that may contain sensitive information. In certain conditions, attackers can escalate LFI to Remote Code Execution (RCE) by combining it with other techniques such as log poisoning or PHP filter chains.

Root Cause

The root cause of this vulnerability lies in the improper handling of user-controllable input within PHP include or require statements in the Opstore theme. The theme code fails to implement adequate input validation, sanitization, or whitelisting of allowed file paths before including files dynamically. This oversight allows attackers to traverse directories and include files outside the intended scope.

Attack Vector

An attacker can exploit this vulnerability by crafting malicious requests that manipulate file path parameters accepted by the Opstore theme. By using directory traversal sequences (such as ../) or other path manipulation techniques, the attacker can reference files anywhere on the server's filesystem that the web server process has read access to.

The vulnerability can be exploited remotely through the WordPress installation without authentication in certain scenarios. Successful exploitation could lead to:

• Disclosure of sensitive configuration files containing database credentials
• Access to server system files
• Potential escalation to remote code execution through log file poisoning techniques
• Compromise of the entire WordPress installation

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-39387

Indicators of Compromise

• Unusual requests containing directory traversal sequences (../, ..%2f, %2e%2e/) in URL parameters
• Access attempts to sensitive files such as /etc/passwd, wp-config.php, or log files through theme endpoints
• Increased error log entries related to file inclusion failures or permission denied errors
• Suspicious web server access logs showing encoded path traversal attempts targeting Opstore theme files

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in request parameters
• Monitor web server logs for requests containing ../ sequences or encoded variants targeting the Opstore theme
• Deploy file integrity monitoring to detect unauthorized access to sensitive configuration files
• Configure intrusion detection systems (IDS) to alert on LFI attack signatures

Monitoring Recommendations

• Enable detailed WordPress access logging and regularly review for suspicious activity patterns
• Set up alerts for failed file access attempts that may indicate exploitation attempts
• Monitor for unusual PHP process behavior such as accessing files outside web directories
• Implement real-time log analysis for early detection of file inclusion attack patterns

How to Mitigate CVE-2025-39387

Immediate Actions Required

• Update the Opstore theme to the latest patched version immediately
• If no patch is available, consider temporarily disabling or removing the Opstore theme
• Implement WAF rules to block path traversal attempts as an interim mitigation
• Audit web server logs for any signs of prior exploitation
• Review file permissions to ensure minimum necessary access for the web server process

Patch Information

Organizations using the Opstore WordPress theme should check for updates from wpoperations. The vulnerability affects Opstore versions through 1.4.5. Consult the Patchstack Vulnerability Report for the latest remediation guidance and patch availability information.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules to filter path traversal sequences in request parameters
• Implement PHP open_basedir restrictions to limit file access to the WordPress directory structure
• Use file system permissions to restrict web server access to only necessary directories
• Consider using a virtual patching solution until an official fix is available
• Temporarily switch to an alternative WordPress theme if the risk is unacceptable

# Apache .htaccess configuration to block common LFI patterns
<IfModule mod_rewrite.c>
RewriteEngine On
# Block path traversal attempts
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f|%2e%2e/) [NC,OR]
RewriteCond %{QUERY_STRING} (etc/passwd|wp-config\.php) [NC]
RewriteRule .* - [F,L]
</IfModule>