CVE-2025-39470: Ivy School Path Traversal Vulnerability

CVE-2025-39470 Overview

CVE-2025-39470 is a Path Traversal vulnerability affecting the ThimPress Ivy School WordPress theme that enables PHP Local File Inclusion (LFI). The vulnerability exists in versions up to and including 1.6.0 of the Ivy School theme, allowing attackers to traverse directory structures using specially crafted path sequences (.../...//') to include arbitrary local PHP files.

Critical Impact

This vulnerability allows unauthenticated attackers to potentially read sensitive files, execute arbitrary PHP code, and compromise the entire WordPress installation through local file inclusion attacks.

Affected Products

• ThimPress Ivy School WordPress Theme version 1.6.0 and earlier
• WordPress installations using the Ivy School theme
• Educational institution websites built with Ivy School theme

Discovery Timeline

• 2025-04-18 - CVE-2025-39470 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-39470

Vulnerability Analysis

This vulnerability is classified under CWE-35 (Path Traversal: '.../...//'). The Ivy School WordPress theme fails to properly sanitize user-supplied input before using it in file path operations. Attackers can exploit this weakness by injecting directory traversal sequences that bypass standard security filters, ultimately achieving PHP Local File Inclusion.

The attack can be executed remotely over the network without authentication. While the attack complexity is considered high, successful exploitation 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 and sanitization of file path parameters within the Ivy School theme. The theme processes user-controllable input that specifies file paths without adequately filtering out or neutralizing special directory traversal characters. The specific pattern .../...//' indicates that the theme may implement basic traversal filtering that can be bypassed using double-encoding or nested traversal sequences.

Attack Vector

The vulnerability is exploitable over the network, allowing remote attackers to target vulnerable WordPress installations without requiring any authentication or user interaction. The attack involves:

1. Identifying a vulnerable endpoint in the Ivy School theme that accepts file path input
2. Crafting a malicious request containing the path traversal sequence (.../...//')
3. Bypassing input filters to reach sensitive files outside the intended directory
4. Including a local PHP file to execute arbitrary code or exfiltrate sensitive information

The path traversal technique used here specifically targets implementations that may strip standard ../ sequences but fail to account for variations like .../...//'. Successful exploitation could allow attackers to include PHP configuration files, access WordPress credentials, or achieve remote code execution by including files containing attacker-controlled content (such as log files or uploaded files).

Detection Methods for CVE-2025-39470

Indicators of Compromise

• Unusual HTTP requests containing path traversal patterns like .../...//', ../, or encoded variants targeting Ivy School theme endpoints
• Web server logs showing attempts to access files outside the WordPress theme directory structure
• Error logs indicating file inclusion failures or unexpected file access attempts
• Unexpected PHP file executions or system file access from the WordPress process

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal sequences including .../...//' patterns
• Monitor HTTP request logs for suspicious file path parameters targeting the Ivy School theme
• Deploy intrusion detection systems (IDS) configured to alert on LFI attack signatures
• Use WordPress security plugins to scan for exploitation attempts and suspicious file access patterns

Monitoring Recommendations

• Enable detailed access logging on web servers hosting WordPress with the Ivy School theme
• Set up real-time alerting for requests containing directory traversal characters targeting theme files
• Regularly audit WordPress file system for unauthorized changes or unexpected file inclusions
• Monitor for anomalous PHP process behavior indicating potential code execution

How to Mitigate CVE-2025-39470

Immediate Actions Required

• Update the Ivy School theme immediately if a patched version is available from ThimPress
• If no patch is available, consider temporarily disabling or removing the Ivy School theme
• Implement WAF rules to block path traversal attack patterns at the perimeter
• Review web server logs for any indicators of exploitation attempts

Patch Information

Users should check the Patchstack WordPress Vulnerability Report for the latest remediation guidance and patch availability from ThimPress. Monitor the theme vendor's official channels for security updates addressing versions beyond 1.6.0.

Workarounds

• Implement strict input validation rules on web servers to reject requests containing path traversal sequences
• Use a web application firewall to filter malicious requests before they reach WordPress
• Restrict file system permissions to limit the impact of potential file inclusion attacks
• Consider using a different WordPress theme until a security patch is released
• Implement PHP open_basedir restrictions to limit file access to the WordPress directory

# Apache .htaccess configuration to block path traversal attempts
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.\\) [NC,OR]
RewriteCond %{QUERY_STRING} (\.\.%2F|\.\.%5C) [NC]
RewriteRule .* - [F,L]

# Additional ModSecurity rule for LFI protection
SecRule REQUEST_URI|ARGS|ARGS_NAMES "@rx \.\.[\\/]" \
    "id:100001,phase:2,deny,status:403,log,msg:'Path Traversal Attack Detected'"