CVE-2026-22449: Don Peppe WordPress Theme LFI Vulnerability

CVE-2026-22449 Overview

CVE-2026-22449 is a Local File Inclusion (LFI) vulnerability affecting the Don Peppe WordPress theme developed by Select-Themes. 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's filesystem.

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program), which represents a critical class of vulnerabilities that can lead to sensitive information disclosure or remote code execution when combined with other attack techniques.

Critical Impact

Attackers can exploit this LFI vulnerability to read sensitive server files, access WordPress configuration details including database credentials, and potentially achieve code execution through log poisoning or other file inclusion attack chains.

Affected Products

• Select-Themes Don Peppe WordPress Theme version 1.3 and earlier
• All WordPress installations running vulnerable versions of the Don Peppe theme

Discovery Timeline

• 2026-03-05 - CVE-2026-22449 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-22449

Vulnerability Analysis

The Don Peppe WordPress theme contains a PHP Local File Inclusion vulnerability that allows attackers to manipulate file path parameters passed to PHP's include() or require() functions. When user-controlled input is not properly sanitized before being used in file inclusion operations, attackers can traverse the directory structure and include arbitrary files from the local filesystem.

This type of vulnerability is particularly dangerous in WordPress environments because attackers can potentially read the wp-config.php file containing database credentials, access log files for log poisoning attacks, or include uploaded files containing malicious PHP code.

Root Cause

The vulnerability exists due to insufficient input validation and sanitization of user-supplied filename parameters before they are passed to PHP file inclusion functions. The theme fails to implement proper security controls such as:

• Whitelist-based validation of allowed file paths
• Removal or encoding of directory traversal sequences (e.g., ../)
• Restriction of file inclusion to specific directories using basename() or similar functions
• Validation of file extensions to prevent inclusion of unexpected file types

Attack Vector

An attacker can exploit this vulnerability by crafting malicious requests that manipulate file path parameters to include local files outside the intended directory scope. The attack typically involves:

1. Identifying the vulnerable parameter that accepts file path input
2. Injecting directory traversal sequences to escape the intended directory
3. Including sensitive files such as /etc/passwd, wp-config.php, or server log files
4. Potentially escalating to remote code execution through techniques like log poisoning or PHP filter chains

The vulnerability mechanism relies on manipulating the include path through directory traversal sequences. Attackers typically inject sequences like ../../../ to navigate up the directory tree and access sensitive files. For detailed technical analysis, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-22449

Indicators of Compromise

• Unusual HTTP requests containing directory traversal patterns such as ../, ..%2f, or ..%252f
• Access attempts to sensitive files like /etc/passwd, wp-config.php, or system log files
• Web server logs showing requests with path manipulation characters targeting theme files
• Unexpected file access patterns in PHP error logs

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block directory traversal attempts
• Monitor web server access logs for requests containing path traversal sequences targeting the Don Peppe theme
• Implement file integrity monitoring on critical WordPress configuration files
• Enable PHP error logging and monitor for file inclusion errors or warnings

Monitoring Recommendations

• Configure SIEM alerts for HTTP requests containing encoded or plaintext directory traversal patterns
• Monitor access to wp-config.php and other sensitive WordPress files from unexpected sources
• Track authentication and access patterns for WordPress administrative functions
• Implement baseline analysis for normal file access patterns to detect anomalous inclusion attempts

How to Mitigate CVE-2026-22449

Immediate Actions Required

• Update the Don Peppe WordPress theme to the latest version if a patch is available
• If no patch is available, consider temporarily disabling or replacing the vulnerable theme
• Implement WAF rules to block directory traversal attempts targeting WordPress themes
• Review server logs for evidence of exploitation attempts
• Restrict file permissions on sensitive configuration files

Patch Information

Users should check for updates from Select-Themes for the Don Peppe WordPress theme. For the latest security information and patch status, refer to the Patchstack Vulnerability Report.

Workarounds

• Implement server-level open_basedir restrictions to limit PHP file access to the WordPress directory
• Configure ModSecurity or similar WAF with rules to block LFI attack patterns
• Use WordPress security plugins that provide virtual patching capabilities
• Consider switching to an alternative WordPress theme until a patch is released

# Example: Add open_basedir restriction in php.ini or .htaccess
# This limits PHP file access to specified directories
php_value open_basedir /var/www/html/wordpress:/tmp

# Example: Block directory traversal in Apache .htaccess
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.) [NC,OR]
RewriteCond %{QUERY_STRING} (\.\.%2f|\.\.%252f) [NC]
RewriteRule .* - [F,L]