CVE-2026-22372: Isida Theme File Inclusion Vulnerability

CVE-2026-22372 Overview

CVE-2026-22372 is a Local File Inclusion (LFI) vulnerability affecting the Isida WordPress theme developed by AncoraThemes. The vulnerability stems from improper control of filename for include/require statements in PHP, allowing attackers to include arbitrary local files on the server. This can lead to sensitive information disclosure, code execution, or full server compromise depending on the server configuration and available files.

Critical Impact

Attackers can exploit this LFI vulnerability to read sensitive configuration files, access credentials, or potentially achieve remote code execution through log poisoning or other advanced techniques.

Affected Products

• AncoraThemes Isida WordPress Theme version 1.4.2 and earlier
• WordPress installations running vulnerable Isida theme versions

Discovery Timeline

• 2026-02-20 - CVE-2026-22372 published to NVD
• 2026-02-20 - Last updated in NVD database

Technical Details for CVE-2026-22372

Vulnerability Analysis

This vulnerability is classified as CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Isida 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 local files from the server's filesystem.

The network-based attack vector requires no authentication, though the attack complexity is considered high. When successfully exploited, the vulnerability can compromise the confidentiality, integrity, and availability of the affected system. Attackers can leverage this flaw to read sensitive files such as wp-config.php, access database credentials, or chain with other vulnerabilities to achieve code execution.

Root Cause

The root cause of this vulnerability lies in insufficient input validation within the Isida theme's file handling logic. When processing user-controlled parameters that determine which files to include, the theme does not adequately sanitize or restrict the input to prevent directory traversal sequences or inclusion of unintended files. This allows malicious actors to craft requests that break out of the intended directory structure and access sensitive files elsewhere on the system.

Attack Vector

The vulnerability is exploitable over the network without requiring authentication. An attacker can craft malicious HTTP requests containing directory traversal sequences (such as ../) or absolute file paths to include sensitive local files. Common attack patterns include:

The exploitation typically involves manipulating a vulnerable parameter to traverse directories and include sensitive files. Attackers commonly target configuration files like wp-config.php which contains database credentials, or attempt to include log files that may have been poisoned with PHP code. The attack requires no user interaction and can be performed remotely against any accessible WordPress installation running the vulnerable theme.

For detailed technical information, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-22372

Indicators of Compromise

• HTTP requests containing directory traversal sequences (../, ..%2f, ..%5c) targeting Isida theme endpoints
• Access attempts to sensitive files such as /etc/passwd, wp-config.php, or log files through theme parameters
• Unusual file access patterns in web server logs indicating file inclusion attempts
• PHP error messages revealing file path information or failed include attempts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block requests containing path traversal patterns
• Monitor web server access logs for suspicious requests targeting theme-specific endpoints with file path parameters
• Deploy file integrity monitoring to detect unauthorized access to sensitive configuration files
• Configure intrusion detection systems to alert on LFI attack patterns

Monitoring Recommendations

• Enable verbose logging for PHP errors and monitor for include/require failures
• Set up alerts for access attempts to sensitive system files through web requests
• Monitor for unusual outbound data exfiltration that may indicate successful file disclosure
• Review WordPress audit logs for suspicious theme-related activity

How to Mitigate CVE-2026-22372

Immediate Actions Required

• Update the Isida WordPress theme to a patched version if available from AncoraThemes
• If no patch is available, consider temporarily disabling or replacing the vulnerable theme
• Implement WAF rules to block path traversal attempts targeting WordPress themes
• Restrict PHP's open_basedir directive to limit file access to the WordPress installation directory

Patch Information

Check the Patchstack Vulnerability Report for the latest patch status and remediation guidance from the vendor. Contact AncoraThemes directly for information about security updates for the Isida theme.

Workarounds

• Configure PHP's open_basedir to restrict file system access to the web root directory
• Deploy a Web Application Firewall with rules to block LFI attack patterns
• Implement strict input validation at the web server level using ModSecurity or similar tools
• Consider switching to an alternative WordPress theme until a security patch is released

# Configuration example - Add to wp-config.php or php.ini to restrict file access
# Limit PHP file operations to WordPress directory only
# php.ini configuration:
open_basedir = /var/www/html/wordpress/

# Apache .htaccess rules to block common LFI patterns
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f|\.\.%5c) [NC,OR]
RewriteCond %{QUERY_STRING} (etc/passwd|wp-config\.php) [NC]
RewriteRule .* - [F,L]
</IfModule>