CVE-2026-27081: Rosebud Theme LFI Vulnerability

CVE-2026-27081 Overview

CVE-2026-27081 is a PHP Local File Inclusion (LFI) vulnerability in the Mikado-Themes Rosebud WordPress theme. The vulnerability stems from improper control of filename for include/require statements in PHP, allowing attackers to include local files on the target system. This can lead to sensitive information disclosure, arbitrary code execution, and complete system compromise.

Critical Impact

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

Affected Products

• Mikado-Themes Rosebud WordPress Theme versions through 1.4
• WordPress installations running vulnerable Rosebud theme versions
• Web servers hosting affected WordPress sites

Discovery Timeline

• 2026-03-25 - CVE-2026-27081 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-27081

Vulnerability Analysis

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

The network-accessible nature of this vulnerability combined with the potential for complete system compromise makes it particularly dangerous for WordPress sites running the affected theme. While exploitation requires some complexity, no user interaction or privileges are needed to launch an attack.

Root Cause

The root cause lies in insufficient input validation and sanitization of user-controllable parameters that are passed to PHP's include(), require(), include_once(), or require_once() functions. The theme fails to implement proper path traversal protections, allowing attackers to escape intended directories and access sensitive files.

Attack Vector

The attack is conducted over the network against WordPress installations running the vulnerable Rosebud theme. An attacker can craft malicious requests containing path traversal sequences (such as ../) or absolute paths to include sensitive local files. Common targets include:

• /etc/passwd for system user enumeration
• wp-config.php for database credentials
• Log files for log poisoning attacks leading to RCE
• Session files for session hijacking

The vulnerability requires no authentication or user interaction, though exploitation complexity is considered high due to the need for proper path construction and server configuration discovery.

Detection Methods for CVE-2026-27081

Indicators of Compromise

• Web server access logs containing path traversal sequences (../, ..%2f, %2e%2e/) in requests to theme files
• Requests attempting to access sensitive system files like /etc/passwd or wp-config.php through theme parameters
• Unusual file access patterns in PHP error logs or application logs
• Requests containing null byte sequences (%00) or URL-encoded path characters

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal attempts in URL parameters
• Configure intrusion detection systems (IDS) to alert on suspicious file inclusion patterns
• Monitor WordPress access logs for requests containing LFI indicators targeting the Rosebud theme
• Deploy file integrity monitoring on critical system and WordPress configuration files

Monitoring Recommendations

• Enable verbose logging for WordPress and the web server to capture detailed request information
• Set up real-time alerting for access attempts to sensitive files like wp-config.php or /etc/passwd
• Implement network traffic analysis to detect anomalous request patterns to the WordPress installation
• Review theme file access patterns regularly for signs of exploitation attempts

How to Mitigate CVE-2026-27081

Immediate Actions Required

• Identify all WordPress installations using the Rosebud theme version 1.4 or earlier
• Consider temporarily disabling or replacing the Rosebud theme until a patched version is available
• Implement WAF rules to block path traversal attempts targeting theme files
• Review web server and WordPress logs for signs of previous exploitation attempts
• Apply the principle of least privilege to PHP file system access

Patch Information

Organizations should monitor the Patchstack WordPress Vulnerability Database for updates regarding patches from Mikado-Themes. Until an official patch is released, site administrators should implement the recommended workarounds and consider alternative themes.

Workarounds

• Implement strict input validation on all user-controllable parameters used in file operations
• Deploy a Web Application Firewall (WAF) with rules specifically targeting LFI and path traversal attacks
• Restrict PHP's open_basedir directive to limit file access to the WordPress directory
• Disable the affected theme and switch to a secure alternative until a patch is available
• Use disable_functions in php.ini to restrict dangerous PHP functions where possible

# PHP configuration hardening example
# Add to php.ini or .htaccess

# Restrict file access to WordPress directory
php_admin_value open_basedir /var/www/html/wordpress/

# Disable dangerous functions
php_admin_value disable_functions "exec,passthru,shell_exec,system,proc_open,popen"

# Enable logging for troubleshooting
php_admin_flag log_errors On
php_admin_value error_log /var/log/php_errors.log