CVE-2026-27097: CasaMia WordPress Theme LFI Vulnerability

CVE-2026-27097 Overview

CVE-2026-27097 is a PHP Local File Inclusion (LFI) vulnerability affecting the AncoraThemes CasaMia Property Rental Real Estate WordPress Theme. The vulnerability stems from improper control of filename parameters in PHP include/require statements, allowing attackers to include arbitrary local files from the server's filesystem. This type of vulnerability (CWE-98) can lead to information disclosure, credential theft, and in certain configurations, remote code execution through log poisoning or other exploitation techniques.

Critical Impact

Attackers can exploit this LFI vulnerability to read sensitive files such as wp-config.php, access database credentials, and potentially achieve code execution on vulnerable WordPress installations running CasaMia theme version 1.1.2 or earlier.

Affected Products

• AncoraThemes CasaMia | Property Rental Real Estate WordPress Theme versions through 1.1.2
• WordPress installations using vulnerable CasaMia theme versions
• Web servers hosting affected WordPress deployments

Discovery Timeline

• 2026-03-05 - CVE-2026-27097 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-27097

Vulnerability Analysis

This vulnerability exists due to improper input validation and sanitization of user-controlled parameters that are subsequently used in PHP include() or require() statements within the CasaMia WordPress theme. When a theme file accepts a filename or path parameter from user input without adequate validation, attackers can manipulate this input to traverse the directory structure and include arbitrary local files.

Local File Inclusion vulnerabilities in WordPress themes are particularly dangerous because they often provide access to the wp-config.php file, which contains database credentials, authentication keys, and other sensitive configuration data. Additionally, if the server allows log files to be included and an attacker can inject PHP code into those logs (via User-Agent headers or other means), the LFI can be escalated to Remote Code Execution.

Root Cause

The root cause of CVE-2026-27097 is the use of unsanitized user input in PHP include or require statements within the CasaMia theme. The theme fails to properly validate and restrict the file paths that can be included, allowing directory traversal sequences (such as ../) to be used to access files outside the intended directory. This violates the principle of least privilege and secure coding practices that mandate strict input validation for any file operations.

Attack Vector

The attack vector for this vulnerability involves an attacker crafting malicious HTTP requests that contain directory traversal sequences in vulnerable theme parameters. By manipulating these parameters, the attacker can force the PHP interpreter to include arbitrary files from the local filesystem. Common exploitation targets include:

• The WordPress configuration file (../../../wp-config.php) to extract database credentials
• System files like /etc/passwd to enumerate users
• Log files that may contain injected PHP code for code execution

The vulnerability can be exploited remotely through standard HTTP requests to the WordPress installation, requiring no authentication in typical exploitation scenarios. For detailed technical information, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2026-27097

Indicators of Compromise

• Unusual HTTP requests containing directory traversal sequences (../, ..%2f, ..%252f) targeting theme endpoints
• Access logs showing requests attempting to include sensitive files such as wp-config.php or /etc/passwd
• Unexpected file access patterns in PHP error logs indicating include failures
• Signs of log poisoning attempts with PHP code injection in User-Agent or Referer headers

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block directory traversal patterns in request parameters
• Monitor HTTP access logs for suspicious requests containing path traversal sequences targeting CasaMia theme files
• Deploy file integrity monitoring on critical WordPress files to detect unauthorized access attempts
• Configure IDS/IPS signatures to alert on common LFI exploitation patterns

Monitoring Recommendations

• Enable verbose PHP error logging and monitor for include/require failures indicating exploitation attempts
• Set up real-time alerting for access to sensitive configuration files from web processes
• Review web server access logs regularly for requests targeting theme-specific endpoints with unusual parameters
• Implement anomaly detection for file access patterns that deviate from normal theme operation

How to Mitigate CVE-2026-27097

Immediate Actions Required

• Update the CasaMia WordPress theme to a patched version if available from AncoraThemes
• If no patch is available, consider temporarily disabling or replacing the vulnerable theme
• Implement Web Application Firewall rules to block directory traversal attempts
• Restrict PHP's open_basedir to limit file access scope for the web server process

Patch Information

Organizations should check with AncoraThemes for an updated version of the CasaMia theme that addresses this vulnerability. Review the Patchstack vulnerability database for the latest patch status and remediation guidance. Until a patch is applied, implement compensating controls to reduce risk.

Workarounds

• Configure PHP's open_basedir directive to restrict file access to the WordPress installation directory only
• Implement strict WAF rules to filter and block requests containing directory traversal sequences
• Use file permission hardening to ensure sensitive files like wp-config.php have restricted read permissions
• Consider implementing a security plugin that provides virtual patching capabilities for WordPress themes

# Configuration example - PHP open_basedir restriction
# Add to php.ini or .htaccess to limit file access scope
php_admin_value open_basedir "/var/www/html/wordpress:/tmp"

# Apache mod_rewrite rule to block directory traversal attempts
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f|\.\.%252f) [NC]
RewriteRule .* - [F,L]