CVE-2025-58891: Sanger Path Traversal Vulnerability

CVE-2025-58891 Overview

CVE-2025-58891 is a PHP Local File Inclusion (LFI) vulnerability affecting the AncoraThemes Sanger WordPress theme. The flaw stems from improper control of filename parameters passed to PHP include or require statements [CWE-98]. Attackers can manipulate file path inputs to load arbitrary local files through the theme's PHP execution context. The vulnerability affects all Sanger theme versions up to and including 1.24.0. Successful exploitation can lead to sensitive information disclosure, configuration file exposure, and potential code execution when combined with file upload primitives. The issue is network-exploitable without authentication, though attack complexity is rated high.

Critical Impact

Unauthenticated attackers can include arbitrary local PHP files, potentially leading to remote code execution and full site compromise on WordPress installations using the Sanger theme.

Affected Products

• AncoraThemes Sanger WordPress Theme versions up to and including 1.24.0
• WordPress installations with the Sanger theme active
• All hosting environments running vulnerable Sanger theme releases

Discovery Timeline

• 2025-12-18 - CVE-2025-58891 published to NVD
• 2026-04-27 - Last updated in NVD database

Technical Details for CVE-2025-58891

Vulnerability Analysis

The vulnerability is classified under [CWE-98], Improper Control of Filename for Include/Require Statement in PHP Program. The Sanger theme accepts user-controlled input that flows into a PHP include or require call without sufficient validation or path normalization. An attacker can supply crafted path values to load arbitrary files within the server's filesystem accessible to the PHP process.

This Local File Inclusion variant of [CWE-98] differs from Remote File Inclusion because PHP's allow_url_include is typically disabled. Even so, attackers can leverage LFI to read configuration files such as wp-config.php, exfiltrate database credentials, or chain the flaw with uploaded files to execute attacker-controlled PHP code.

Root Cause

The root cause is missing or insufficient sanitization of user-supplied filename parameters before they reach a PHP file inclusion statement. The theme code likely concatenates a request parameter directly into an include path without using an allowlist of permitted files or validating the resolved path against a base directory.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker sends a crafted HTTP request to a vulnerable Sanger theme endpoint, supplying a path parameter that references a local file. The PHP interpreter loads and executes the referenced file in the WordPress request context. See the Patchstack WordPress Vulnerability advisory for additional technical context. No public proof-of-concept exploit code is available at this time.

Detection Methods for CVE-2025-58891

Indicators of Compromise

• HTTP requests to Sanger theme PHP files containing path traversal sequences such as ../ or encoded variants like %2e%2e%2f
• Requests with parameters referencing sensitive files like wp-config.php, /etc/passwd, or PHP wrappers like php://filter
• Unexpected access patterns to /wp-content/themes/sanger/ PHP files from external sources
• Web server logs showing 200 OK responses to requests containing suspicious filename parameters

Detection Strategies

• Inspect web server access logs for query strings containing directory traversal patterns targeting the Sanger theme directory
• Deploy web application firewall rules to flag inclusion attempts referencing system files or PHP stream wrappers
• Monitor PHP error logs for include() or require() warnings referencing unexpected file paths
• Compare installed Sanger theme version against the patched release using WordPress admin or wp-cli

Monitoring Recommendations

• Enable detailed PHP logging with log_errors = On and review entries for unexpected file inclusion attempts
• Implement file integrity monitoring on wp-config.php and theme directories to detect tampering
• Alert on outbound connections from web servers that may indicate post-exploitation activity

How to Mitigate CVE-2025-58891

Immediate Actions Required

• Identify all WordPress installations running the AncoraThemes Sanger theme and inventory their versions
• Update the Sanger theme to a release newer than 1.24.0 as soon as the vendor publishes a patched version
• Restrict access to vulnerable theme endpoints via web application firewall rules until patching is complete
• Rotate database credentials and WordPress secret keys if exploitation is suspected

Patch Information

A fixed version beyond Sanger 1.24.0 should be applied when made available by AncoraThemes. Refer to the Patchstack advisory for the latest patch status and remediation guidance.

Workarounds

• Disable or temporarily switch away from the Sanger theme on production sites until a patched release is installed
• Configure PHP open_basedir to restrict file access to the WordPress installation directory
• Set allow_url_include = Off and allow_url_fopen = Off in php.ini to limit inclusion primitives
• Deploy WAF rules that block requests containing directory traversal sequences or PHP stream wrappers

# Configuration example: restrict PHP file inclusion scope
# Add to php.ini or site-specific PHP configuration
allow_url_include = Off
allow_url_fopen = Off
open_basedir = "/var/www/html:/tmp"

# Verify Sanger theme version using wp-cli
wp theme get sanger --field=version