CVE-2026-28119: Nirvana Theme PHP File Inclusion Flaw

CVE-2026-28119 Overview

CVE-2026-28119 is a Local File Inclusion (LFI) vulnerability affecting the Nirvana WordPress theme by axiomthemes. The vulnerability stems from improper control of filename parameters used in PHP include/require statements (CWE-98), allowing attackers to include arbitrary local files from the server filesystem.

This vulnerability enables unauthenticated attackers to potentially read sensitive configuration files, access credentials stored on the server, and in some scenarios chain with other vulnerabilities to achieve remote code execution.

Critical Impact

Unauthenticated attackers can exploit this LFI vulnerability to read sensitive server files, potentially exposing database credentials, API keys, and configuration data that could lead to full site compromise.

Affected Products

• WordPress Nirvana Theme version 2.6 and earlier
• All WordPress installations using vulnerable Nirvana theme versions

Discovery Timeline

• 2026-03-05 - CVE-2026-28119 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-28119

Vulnerability Analysis

This vulnerability is classified as CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Nirvana WordPress theme fails to properly sanitize user-supplied input before using it in PHP include() or require() statements. This allows an attacker to manipulate the filename parameter to traverse directories and include arbitrary files from the local filesystem.

The attack can be performed remotely over the network, though exploitation requires specific conditions to be met, making successful attacks more complex. When exploited successfully, attackers can achieve significant impacts to confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of CVE-2026-28119 lies in insufficient input validation and sanitization within the Nirvana theme's PHP code. When processing requests, the theme accepts user-controlled input that is directly passed to file inclusion functions without proper filtering of path traversal sequences such as ../ or validation against an allowlist of permitted files.

WordPress themes often dynamically include template files or components based on request parameters. When these parameters are not properly validated, attackers can escape the intended directory structure and include sensitive files like /etc/passwd, wp-config.php, or log files containing sensitive information.

Attack Vector

The vulnerability is exploitable via the network without requiring authentication. An attacker can craft malicious HTTP requests containing path traversal sequences to include local files from the WordPress server.

A typical exploitation scenario involves:

1. The attacker identifies a vulnerable endpoint in the Nirvana theme that accepts file path input
2. The attacker crafts a request with directory traversal sequences to escape the theme directory
3. The server processes the malicious path and includes the targeted file
4. Sensitive file contents may be returned in the response or processed by the PHP interpreter

When targeting PHP files, the included content is executed as PHP code. When targeting non-PHP files like wp-config.php or /etc/passwd, the raw contents may be exposed depending on how the inclusion is handled. For detailed technical information, refer to the Patchstack WordPress Vulnerability Database.

Detection Methods for CVE-2026-28119

Indicators of Compromise

• HTTP requests to Nirvana theme files containing path traversal patterns such as ../ or ..%2f
• Unusual access to theme PHP files with long or encoded path parameters
• Web server logs showing requests attempting to access files outside the theme directory
• Unexpected file read operations in PHP execution logs

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal sequences in request parameters
• Monitor web server access logs for suspicious patterns targeting theme files with unusual path inputs
• Deploy intrusion detection signatures for common LFI attack patterns
• Enable PHP error logging to detect failed file inclusion attempts

Monitoring Recommendations

• Configure alerting on repeated failed file inclusion attempts from single IP addresses
• Monitor for access to sensitive files like wp-config.php or system files from web processes
• Implement real-time log analysis for path traversal indicators in HTTP requests
• Review WordPress access patterns for anomalous requests to theme endpoints

How to Mitigate CVE-2026-28119

Immediate Actions Required

• Update the Nirvana WordPress theme to a patched version when available from axiomthemes
• Temporarily disable or remove the Nirvana theme if no patch is available and the site is at risk
• Implement WAF rules to block requests containing path traversal sequences targeting the theme
• Review server logs for signs of exploitation attempts

Patch Information

Organizations using the Nirvana WordPress theme should monitor for security updates from axiomthemes. The vulnerability affects all versions through 2.6. Check the Patchstack vulnerability database for the latest patch status and remediation guidance. Until a patch is released, implement the recommended workarounds below.

Workarounds

• Deploy a Web Application Firewall with rules blocking path traversal patterns in all request parameters
• Use a WordPress security plugin that monitors and blocks LFI attack attempts
• Restrict PHP open_basedir configuration to limit file access to the WordPress installation directory
• Consider switching to an alternative theme if the vulnerability remains unpatched

# Example Apache ModSecurity rule to block path traversal attempts
SecRule ARGS "@contains ../" "id:100001,phase:2,deny,status:403,msg:'Path Traversal Attack Blocked'"
SecRule ARGS "@contains ..%2f" "id:100002,phase:2,deny,status:403,msg:'Encoded Path Traversal Blocked'"

# PHP open_basedir restriction in php.ini or .htaccess
# php_admin_value open_basedir /var/www/html/wordpress/