CVE-2026-25457: Mixtape Theme File Inclusion Vulnerability

CVE-2026-25457 Overview

CVE-2026-25457 is an Improper Control of Filename for Include/Require Statement vulnerability (CWE-98) affecting the Select-Themes Mixtape WordPress theme. This PHP Local File Inclusion (LFI) vulnerability allows attackers to include arbitrary local files through improper handling of user-supplied input in PHP include or require statements. The vulnerability can potentially lead to sensitive information disclosure, code execution, or complete site compromise.

Critical Impact

This vulnerability allows unauthenticated attackers to include arbitrary local files from the server, potentially exposing sensitive configuration files, credentials, or enabling code execution through log file poisoning techniques.

Affected Products

• Select-Themes Mixtape WordPress Theme version 2.1 and earlier
• WordPress installations using the Mixtape theme

Discovery Timeline

• 2026-03-25 - CVE CVE-2026-25457 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-25457

Vulnerability Analysis

This vulnerability stems from improper validation of user-controlled input that is subsequently used in PHP's include() or require() functions. When the Mixtape theme processes certain requests, it fails to adequately sanitize file path parameters, allowing attackers to manipulate the include path and access files outside the intended directory scope.

The attack can be executed remotely over the network, though it requires specific conditions to be met for successful exploitation. Once exploited, an attacker can read sensitive files from the server's filesystem, potentially including WordPress configuration files (wp-config.php), database credentials, or other sensitive data. In more advanced scenarios, attackers may chain this vulnerability with log file poisoning or other techniques to achieve remote code execution.

Root Cause

The root cause is the lack of proper input validation and sanitization in the theme's file inclusion logic. The vulnerable code accepts user-supplied input and passes it directly to PHP include or require statements without adequately restricting the allowable file paths. This violates the security principle of never trusting user input, particularly when that input influences file system operations.

The theme fails to implement path canonicalization, allowlist validation, or other defensive measures that would prevent directory traversal sequences (such as ../) from being processed.

Attack Vector

The vulnerability is exploitable via network-based attacks against WordPress installations running the affected Mixtape theme versions. An attacker crafts a malicious HTTP request containing directory traversal sequences or manipulated file path parameters. The vulnerable theme code processes this input and includes the attacker-specified file.

A typical attack scenario involves sending a request with a path traversal payload such as ../../../../etc/passwd or ../../../../wp-config.php to read sensitive system or WordPress configuration files. More sophisticated attacks may involve PHP filter wrappers or log file poisoning to escalate from file inclusion to remote code execution.

Detection Methods for CVE-2026-25457

Indicators of Compromise

• Unusual HTTP requests to WordPress theme files containing directory traversal patterns (../, ..%2f, or encoded variants)
• Web server access logs showing requests with PHP wrapper strings (php://filter, php://input)
• Unexpected file access patterns in server logs targeting system files outside the web root
• Error messages in PHP logs indicating failed file inclusion attempts

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block path traversal patterns in HTTP requests
• Implement file integrity monitoring on critical WordPress files to detect unauthorized access
• Enable verbose logging on the web server and monitor for anomalous file access patterns
• Configure intrusion detection systems (IDS) to alert on known LFI exploitation signatures

Monitoring Recommendations

• Review web server access logs regularly for requests containing path traversal sequences
• Monitor PHP error logs for include/require warnings that may indicate exploitation attempts
• Set up alerting for access to sensitive files like wp-config.php from unusual sources
• Audit theme file changes and access patterns through WordPress security plugins

How to Mitigate CVE-2026-25457

Immediate Actions Required

• Update the Mixtape theme to the latest patched version when available from Select-Themes
• If no patch is available, consider temporarily disabling or replacing the Mixtape theme
• Implement WAF rules to block path traversal attempts targeting the WordPress installation
• Review server access logs for evidence of prior exploitation attempts

Patch Information

Refer to the Patchstack Theme Vulnerability Report for the latest patch status and remediation guidance from the vendor. Site administrators should check Select-Themes for an updated version of the Mixtape theme that addresses this vulnerability.

Workarounds

• Implement server-side restrictions using .htaccess or web server configuration to block requests containing path traversal sequences
• Apply PHP open_basedir restrictions to limit file access to the WordPress installation directory
• Use a security plugin such as Wordfence or Sucuri to add additional input filtering and monitoring
• Consider implementing a virtual patching solution through your WAF while awaiting an official fix

# Apache .htaccess configuration to block common LFI attempts
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f|\.\.%252f) [NC,OR]
RewriteCond %{QUERY_STRING} (php://|data://|expect://|zip://) [NC]
RewriteRule .* - [F,L]