CVE-2025-22508: FAT Event Lite File Inclusion Vulnerability

CVE-2025-22508 Overview

CVE-2025-22508 is a PHP Local File Inclusion (LFI) vulnerability affecting the FAT Event Lite WordPress plugin developed by roninwp. This vulnerability stems from improper control of filename for include/require statements in PHP, allowing unauthenticated attackers to include local files on the target system through network-based attacks. The vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program).

Critical Impact

Unauthenticated attackers can exploit this Local File Inclusion vulnerability to read sensitive files, potentially leading to information disclosure, configuration exposure, and in certain scenarios, remote code execution through log poisoning or other chained attacks.

Affected Products

• FAT Event Lite WordPress Plugin version 1.1 and earlier
• WordPress installations with the fat-event-lite plugin installed
• All versions from initial release through version 1.1

Discovery Timeline

• 2025-01-09 - CVE-2025-22508 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-22508

Vulnerability Analysis

This vulnerability exists due to insufficient validation of user-supplied input in file inclusion operations within the FAT Event Lite plugin. The plugin fails to properly sanitize or validate filenames before passing them to PHP include or require statements, enabling attackers to manipulate file paths and include arbitrary local files from the server's filesystem.

The attack can be executed remotely over the network without requiring any user interaction or prior 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 CVE-2025-22508 lies in the plugin's failure to implement proper input validation and sanitization for file path parameters. The FAT Event Lite plugin does not adequately restrict or validate the filename parameter used in PHP include/require statements, allowing attackers to traverse directories and include files outside the intended scope.

This type of vulnerability typically occurs when:

• User-controlled input is directly concatenated into file paths
• Lack of allowlist validation for permitted files
• Insufficient path traversal filtering (e.g., ../ sequences)
• Missing validation of file extensions or base directories

Attack Vector

The vulnerability is exploitable via network-based attacks without authentication. An attacker can craft malicious requests to the vulnerable WordPress plugin endpoint, manipulating file path parameters to include local files from the server.

Common exploitation techniques for LFI vulnerabilities include:

Path Traversal: Attackers use directory traversal sequences like ../ to navigate outside the web root and access sensitive system files such as /etc/passwd, configuration files, or application source code.

Log Poisoning: By injecting PHP code into server logs (access logs, error logs) and subsequently including those log files, attackers can achieve remote code execution.

Wrapper Abuse: PHP stream wrappers like php://filter can be used to read file contents encoded in base64, bypassing certain security restrictions.

For detailed technical analysis and proof-of-concept information, refer to the Patchstack vulnerability database.

Detection Methods for CVE-2025-22508

Indicators of Compromise

• Unusual access patterns to the FAT Event Lite plugin endpoints
• Web server logs containing path traversal sequences (e.g., ../, ..%2f, %2e%2e/) in request parameters
• Requests attempting to access sensitive files like /etc/passwd, wp-config.php, or log files
• Unexpected file read operations from the WordPress plugin directory

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in HTTP requests
• Monitor WordPress plugin directories for suspicious activity using file integrity monitoring solutions
• Enable detailed access logging on web servers and analyze for LFI attack patterns
• Deploy SentinelOne Singularity Platform to detect and respond to file inclusion attempts and suspicious PHP execution behaviors

Monitoring Recommendations

• Configure alerts for requests containing encoded traversal sequences (%2e, %2f, %00)
• Monitor PHP error logs for failed include/require operations that may indicate exploitation attempts
• Implement network-level monitoring for unusual outbound connections following potential code execution
• Review web server access logs regularly for reconnaissance activity targeting WordPress plugins

How to Mitigate CVE-2025-22508

Immediate Actions Required

• Disable or remove the FAT Event Lite plugin (fat-event-lite) from all WordPress installations until a patched version is available
• Audit WordPress installations to identify any sites running the vulnerable plugin version 1.1 or earlier
• Implement WAF rules to block path traversal patterns targeting WordPress plugin endpoints
• Review server logs for any indicators of prior exploitation attempts

Patch Information

At the time of publication, users should monitor the Patchstack vulnerability advisory for updates regarding an official security patch from the plugin developer. Until a patch is released, the recommended course of action is to deactivate and remove the vulnerable plugin from production WordPress installations.

Workarounds

• Deactivate and delete the FAT Event Lite plugin from WordPress installations
• Implement server-level restrictions using open_basedir PHP configuration to limit file inclusion scope
• Deploy a Web Application Firewall with rules specifically targeting LFI attack patterns
• Use WordPress security plugins that provide virtual patching capabilities for known vulnerabilities

# Disable the vulnerable plugin via WP-CLI
wp plugin deactivate fat-event-lite --all

# Remove the plugin entirely
wp plugin delete fat-event-lite

# Set open_basedir restriction in PHP configuration (php.ini or .htaccess)
# php.ini example:
# open_basedir = /var/www/html:/tmp