CVE-2025-63017: WerkStatt Plugin LFI Vulnerability

CVE-2025-63017 Overview

CVE-2025-63017 is a Local File Inclusion (LFI) vulnerability affecting the WerkStatt Plugin for WordPress, developed by fuelthemes. This vulnerability stems from improper control of filename parameters used in PHP include/require statements, which allows attackers to include arbitrary local files on the server. The vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program).

Local File Inclusion vulnerabilities in WordPress plugins represent a significant security risk as they can lead to sensitive information disclosure, configuration file exposure, and in some scenarios, remote code execution when combined with other attack vectors such as log poisoning or file upload vulnerabilities.

Critical Impact

Attackers can exploit this vulnerability to read sensitive files from the WordPress installation, potentially exposing database credentials, configuration secrets, and other sensitive data stored on the server.

Affected Products

• WerkStatt Plugin versions up to and including 1.6.6
• WordPress installations running vulnerable versions of the werkstatt-plugin

Discovery Timeline

• 2026-01-22 - CVE-2025-63017 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-63017

Vulnerability Analysis

The WerkStatt Plugin contains a PHP Local File Inclusion vulnerability that allows attackers to manipulate filename parameters passed to PHP include or require functions. When user-controlled input is insufficiently validated before being used in file inclusion operations, an attacker can craft malicious requests to include arbitrary files from the local file system.

In a WordPress environment, this type of vulnerability is particularly dangerous as it may allow attackers to read the wp-config.php file containing database credentials, access log files for potential log poisoning attacks, or traverse directories to access sensitive system files outside the web root.

Root Cause

The root cause of this vulnerability lies in improper input validation and sanitization of user-supplied filename parameters before they are used in PHP include or require statements. The WerkStatt Plugin fails to adequately filter path traversal sequences and validate that requested files are within expected directories, allowing attackers to specify arbitrary file paths.

Attack Vector

An attacker can exploit this vulnerability by sending specially crafted HTTP requests to the vulnerable WordPress plugin endpoint. The attack typically involves manipulating a filename parameter to include path traversal sequences (e.g., ../) that allow navigation outside the intended directory structure.

The exploitation process involves identifying the vulnerable parameter, crafting a payload with directory traversal sequences, and targeting sensitive files such as /etc/passwd on Linux systems or WordPress configuration files. Successful exploitation requires network access to the vulnerable WordPress installation but does not require authentication in typical LFI scenarios.

For detailed technical information about this vulnerability, refer to the Patchstack security advisory.

Detection Methods for CVE-2025-63017

Indicators of Compromise

• Unusual HTTP requests containing path traversal sequences (../, ..%2f, %2e%2e/) targeting the WerkStatt Plugin
• Web server logs showing requests attempting to access sensitive files like /etc/passwd, wp-config.php, or .htaccess
• Unexpected file access patterns in application logs indicating directory traversal attempts
• POST or GET parameters containing encoded path traversal characters targeting plugin endpoints

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in requests to the werkstatt-plugin directory
• Monitor HTTP access logs for requests containing sequences such as ../, ..%2f, %252e%252e%252f, or similar encoded traversal patterns
• Deploy file integrity monitoring on sensitive configuration files to detect unauthorized access attempts
• Use intrusion detection systems (IDS) with signatures for PHP Local File Inclusion attack patterns

Monitoring Recommendations

• Enable verbose logging for WordPress and the WerkStatt Plugin to capture detailed request information
• Configure alerts for high-volume requests targeting plugin endpoints with unusual parameter values
• Implement real-time log analysis to identify LFI exploitation attempts using SIEM solutions
• Monitor for unexpected PHP errors or warnings that may indicate failed file inclusion attempts

How to Mitigate CVE-2025-63017

Immediate Actions Required

• Update the WerkStatt Plugin to a patched version if available from the vendor
• If no patch is available, consider temporarily deactivating the WerkStatt Plugin until a security update is released
• Implement WAF rules to block requests containing path traversal sequences targeting the vulnerable plugin
• Review web server access logs for signs of exploitation attempts and investigate any suspicious activity

Patch Information

WordPress administrators should check for updates to the WerkStatt Plugin through the WordPress admin dashboard or by visiting the plugin vendor's website. As this vulnerability affects versions up to and including 1.6.6, ensure you are running a version newer than 1.6.6 once a patch is released.

For the latest security information about this vulnerability, consult the Patchstack vulnerability database entry.

Workarounds

• Temporarily disable the WerkStatt Plugin if it is not critical to site functionality until a patch is available
• Implement strict input validation at the web server level using ModSecurity or similar WAF solutions to filter path traversal attempts
• Restrict file system permissions to limit the files that the web server user can access, reducing the impact of successful exploitation
• Consider using a virtual patching solution like Patchstack to protect against this vulnerability while awaiting an official fix

# Example ModSecurity rule to block path traversal attempts
# Add to your Apache/Nginx ModSecurity configuration
SecRule REQUEST_URI|ARGS|ARGS_NAMES "@rx (\.\./|\.\.\\)" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'Path Traversal Attack Detected - CVE-2025-63017',\
    tag:'attack-lfi',\
    severity:'CRITICAL'"