CVE-2025-69400: ThemeREX Yokoo File Inclusion Vulnerability

CVE-2025-69400 Overview

CVE-2025-69400 is a PHP Local File Inclusion (LFI) vulnerability affecting the ThemeREX Yokoo WordPress theme. 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 can lead to unauthorized access to sensitive configuration files, potential remote code execution through log poisoning or other chained attacks, and complete compromise of the affected WordPress installation.

Critical Impact

This vulnerability enables unauthenticated attackers to read sensitive files from the server, potentially exposing database credentials, API keys, and other confidential information stored on the web server.

Affected Products

• ThemeREX Yokoo WordPress Theme version 1.1.11 and earlier
• WordPress installations using the Yokoo theme

Discovery Timeline

• 2026-02-20 - CVE CVE-2025-69400 published to NVD
• 2026-02-24 - Last updated in NVD database

Technical Details for CVE-2025-69400

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Yokoo WordPress theme fails to properly sanitize user-supplied input before using it in PHP include or require statements. When user-controlled data is passed directly to these functions without adequate validation, attackers can manipulate the file path to include unintended files from the local filesystem.

The network-based attack vector means exploitation can occur remotely without authentication, though the high attack complexity indicates that successful exploitation may require specific conditions or configurations to be present on the target system. A successful attack could result in complete compromise of confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of this vulnerability lies in insufficient input validation within the Yokoo theme's file handling mechanisms. PHP's include() and require() functions accept dynamic file paths, and when user input flows into these functions without proper sanitization, attackers can traverse the directory structure or specify arbitrary file paths. The theme likely fails to implement proper allowlisting of permitted file paths, allowing path traversal sequences such as ../ or absolute paths to be processed.

Attack Vector

Exploitation of this Local File Inclusion vulnerability typically involves manipulating request parameters that control which files are loaded by the theme. An attacker can craft malicious requests containing path traversal sequences to navigate outside the intended directory and access sensitive system files such as /etc/passwd, WordPress configuration files like wp-config.php, or other files containing credentials and sensitive data.

The vulnerability can potentially be escalated to remote code execution through various techniques including log file poisoning (injecting PHP code into log files and then including them), session file inclusion, or leveraging PHP wrapper protocols if not properly restricted.

For detailed technical analysis of this vulnerability, refer to the Patchstack WordPress Vulnerability Analysis.

Detection Methods for CVE-2025-69400

Indicators of Compromise

• Unusual access patterns to theme files with path traversal sequences (../, ..%2f, %2e%2e/) in request parameters
• Web server logs showing requests attempting to access system files like /etc/passwd or wp-config.php
• Unexpected file access errors in PHP error logs indicating failed inclusion attempts
• Suspicious GET or POST parameters containing file path references to sensitive locations

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block path traversal patterns in incoming requests
• Implement file integrity monitoring on critical WordPress and server configuration files
• Configure intrusion detection systems (IDS) to alert on LFI attack signatures
• Monitor PHP error logs for file inclusion failures and permission denied messages

Monitoring Recommendations

• Enable verbose logging on web servers to capture full request URIs and parameters
• Set up real-time alerting for requests containing common LFI patterns targeting the Yokoo theme
• Regularly review access logs for unusual patterns involving theme endpoint requests
• Monitor for unexpected information disclosure such as configuration file contents in responses

How to Mitigate CVE-2025-69400

Immediate Actions Required

• Update the Yokoo WordPress theme to a patched version as soon as one becomes available from ThemeREX
• If no patch is available, consider temporarily deactivating the Yokoo theme and switching to a secure alternative
• Implement WAF rules to block requests containing path traversal sequences targeting WordPress theme files
• Audit server permissions to ensure PHP processes cannot access files outside the web root unnecessarily

Patch Information

Organizations should monitor the ThemeREX vendor website and the Patchstack WordPress Vulnerability Analysis for patch availability. Apply updates to version 1.1.12 or later when released. Prior to patching, implement compensating controls to reduce exploitation risk.

Workarounds

• Deploy a Web Application Firewall with rules specifically blocking path traversal patterns in requests to WordPress theme directories
• Restrict PHP's open_basedir directive to limit file access to the WordPress installation directory
• Disable PHP wrappers like php://, data://, and expect:// through php.ini configuration if not required
• Implement server-level access controls to prevent reading of sensitive system files by the web server process

# PHP configuration hardening example (php.ini)
# Restrict file access to WordPress directory only
open_basedir = /var/www/html/wordpress/

# Disable dangerous PHP wrappers
allow_url_include = Off
allow_url_fopen = Off