CVE-2025-28979: Thimpress WP Pipes Path Traversal Flaw

CVE-2025-28979 Overview

CVE-2025-28979 is a critical Local File Inclusion (LFI) vulnerability affecting the ThimPress WP Pipes plugin for WordPress. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files on the server. This issue affects all versions of WP Pipes from the initial release through version 1.4.3.

Critical Impact

Unauthenticated attackers can exploit this vulnerability over the network to read sensitive files, potentially leading to complete site compromise, credential theft, and remote code execution through log poisoning or other LFI-to-RCE escalation techniques.

Affected Products

• ThimPress WP Pipes versions up to and including 1.4.3
• WordPress installations running vulnerable WP Pipes plugin versions
• Websites using WP Pipes for content automation and data piping

Discovery Timeline

• 2025-08-14 - CVE-2025-28979 published to NVD
• 2025-12-01 - Last updated in NVD database

Technical Details for CVE-2025-28979

Vulnerability Analysis

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

The vulnerability can be exploited remotely without authentication, requiring no user interaction. Successful exploitation grants attackers access to sensitive files including configuration files containing database credentials, authentication tokens, and other secrets. Attackers may also achieve remote code execution by combining this LFI with techniques such as log file poisoning, where malicious PHP code is injected into access logs and subsequently included.

Root Cause

The root cause is inadequate input validation in the WP Pipes plugin's file handling mechanism. User-controllable parameters are passed directly to PHP's include() or require() functions without proper sanitization, path validation, or allowlist enforcement. The plugin fails to restrict file inclusions to an expected directory or set of files, enabling directory traversal sequences (such as ../) to reach sensitive files outside the intended scope.

Attack Vector

The attack is conducted over the network against vulnerable WordPress installations. An attacker can craft malicious HTTP requests containing path traversal sequences to target specific files on the server. Common targets include:

• WordPress configuration files (wp-config.php) containing database credentials
• System files like /etc/passwd for user enumeration
• Application log files for log poisoning attacks
• PHP session files for session hijacking

The attack requires no prior authentication or special privileges, making any publicly accessible WordPress site running the vulnerable plugin a potential target. Due to the straightforward nature of exploitation, attackers with minimal technical expertise can compromise affected systems.

Detection Methods for CVE-2025-28979

Indicators of Compromise

• Unusual HTTP requests to WP Pipes plugin endpoints containing path traversal sequences (../, ..%2f, ....//)
• Web server access logs showing repeated requests targeting WP Pipes with encoded special characters
• Evidence of sensitive file access in server logs (attempts to access /etc/passwd, wp-config.php)
• Anomalous PHP error logs indicating failed file inclusion attempts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in requests
• Monitor WordPress plugin directories for unauthorized file modifications or new file creations
• Deploy log analysis tools to identify suspicious access patterns targeting plugin endpoints
• Utilize file integrity monitoring to detect unauthorized reads of sensitive configuration files

Monitoring Recommendations

• Enable verbose logging for web server access and error logs to capture exploitation attempts
• Configure alerting for requests containing directory traversal patterns or encoded path characters
• Monitor for signs of post-exploitation activity such as new user accounts or modified files
• Review authentication logs for unauthorized access following potential file disclosure

How to Mitigate CVE-2025-28979

Immediate Actions Required

• Update WP Pipes plugin to a patched version if available from ThimPress
• Disable or uninstall the WP Pipes plugin until a security patch is released
• Implement WAF rules to block path traversal patterns targeting WP Pipes endpoints
• Review server logs for signs of exploitation and rotate credentials if compromise is suspected

Patch Information

Organizations should monitor the Patchstack WP Pipes Vulnerability advisory for the latest patch information. Verify plugin version is beyond 1.4.3 after any update. Until an official patch is available, consider removing the plugin entirely from production environments.

Workarounds

• Temporarily deactivate and remove the WP Pipes plugin from WordPress installations
• Implement server-side controls such as open_basedir to restrict PHP file access to the web root
• Deploy virtual patching through WAF rules to filter malicious requests at the network edge
• Restrict access to WordPress admin and plugin directories through .htaccess or web server configuration

# Example .htaccess rules to restrict plugin access
<IfModule mod_rewrite.c>
RewriteEngine On
# Block requests with path traversal patterns
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f|\.\.\\) [NC,OR]
RewriteCond %{REQUEST_URI} (\.\./|\.\.%2f|\.\.\\) [NC]
RewriteRule .* - [F,L]
</IfModule>