CVE-2026-27337: Chronicle WordPress Theme LFI Vulnerability

CVE-2026-27337 Overview

CVE-2026-27337 is a PHP Local File Inclusion (LFI) vulnerability affecting the AncoraThemes Chronicle - Lifestyle Magazine & Blog WordPress Theme. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files from the server filesystem.

This vulnerability enables attackers to read sensitive server files, potentially exposing configuration data, credentials, and other critical information. In certain configurations, LFI vulnerabilities can be chained with other techniques to achieve remote code execution.

Critical Impact

Attackers can leverage this Local File Inclusion vulnerability to read sensitive files on the WordPress server, potentially leading to credential theft, configuration exposure, and in some cases, remote code execution through log poisoning or other chaining techniques.

Affected Products

• Chronicle - Lifestyle Magazine & Blog WordPress Theme versions up to and including 1.0
• AncoraThemes Chronicle theme installations on WordPress

Discovery Timeline

• 2026-03-05 - CVE CVE-2026-27337 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-27337

Vulnerability Analysis

The Chronicle WordPress theme by AncoraThemes contains a PHP Local File Inclusion vulnerability classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). This weakness occurs when user-controllable input is passed to PHP file inclusion functions (include, require, include_once, require_once) without proper sanitization or validation.

The vulnerable code path allows an attacker to manipulate file path parameters, enabling them to traverse directories and include arbitrary files from the local filesystem. This can expose sensitive WordPress configuration files such as wp-config.php, server configuration files, and other critical data.

Root Cause

The root cause of this vulnerability is insufficient input validation on filename parameters used in PHP include or require statements within the Chronicle theme. The theme fails to properly sanitize user-supplied input before using it to dynamically include PHP files, allowing path traversal sequences (such as ../) to navigate outside the intended directory structure.

Attack Vector

The attack vector for this vulnerability involves submitting specially crafted requests to the WordPress installation with manipulated file path parameters. An attacker can exploit this by:

1. Identifying endpoints in the Chronicle theme that accept user input for file inclusion
2. Crafting malicious requests containing path traversal sequences
3. Targeting sensitive files such as /etc/passwd, wp-config.php, or application logs
4. Potentially chaining with log poisoning techniques to achieve code execution

The vulnerability allows attackers to read files accessible by the web server process, with potential escalation to remote code execution depending on server configuration and available chaining techniques.

Detection Methods for CVE-2026-27337

Indicators of Compromise

• Unusual HTTP requests containing path traversal patterns (../, ..%2f, ....//) in theme-related parameters
• Access log entries showing attempts to include system files like /etc/passwd or wp-config.php
• Unexpected file access patterns in web server logs targeting the Chronicle theme directory
• Signs of log poisoning attempts in PHP error or access logs

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in request parameters
• Monitor WordPress access logs for requests containing suspicious file inclusion patterns targeting theme endpoints
• Deploy file integrity monitoring on sensitive configuration files to detect unauthorized access attempts
• Review PHP error logs for failed file inclusion attempts indicating exploitation attempts

Monitoring Recommendations

• Enable detailed logging for WordPress and web server access to capture exploitation attempts
• Configure real-time alerting for path traversal patterns in web requests
• Monitor for unusual file read operations by the web server process
• Implement anomaly detection for requests to the Chronicle theme endpoints

How to Mitigate CVE-2026-27337

Immediate Actions Required

• Deactivate the Chronicle WordPress theme immediately if no patch is available
• Switch to a different, secure WordPress theme until a patched version is released
• Review web server logs for any signs of exploitation attempts
• Implement WAF rules to block path traversal patterns as a temporary measure

Patch Information

No official patch information is currently available. Organizations should monitor the Patchstack Vulnerability Report for updates on remediation steps and patch availability from AncoraThemes.

Workarounds

• Disable or remove the Chronicle theme until a security update is released
• Implement Web Application Firewall rules to filter path traversal sequences
• Restrict file system permissions to limit the scope of potential file inclusion
• Use PHP configuration options such as open_basedir to limit accessible directories

# Configuration example - Restrict PHP open_basedir in WordPress
# Add to .htaccess or Apache configuration
php_admin_value open_basedir "/var/www/html/wordpress:/tmp"

# Or in php.ini
open_basedir = "/var/www/html/wordpress:/tmp"