CVE-2025-59588: Soledad Theme LFI Vulnerability

CVE-2025-59588 Overview

CVE-2025-59588 is a Local File Inclusion (LFI) vulnerability affecting the PenciDesign Soledad WordPress theme. The flaw stems from Improper Control of Filename for Include/Require Statement in a PHP program [CWE-98]. It impacts all Soledad versions up to and including 8.6.8. An authenticated attacker with low privileges can supply a crafted filename parameter to coerce the theme into including arbitrary local PHP files. Successful exploitation can lead to disclosure of sensitive files, execution of attacker-controlled PHP code already present on the host, and full compromise of the underlying WordPress installation.

Critical Impact

Authenticated attackers can include arbitrary local PHP files through the Soledad theme, leading to information disclosure and potential remote code execution on the WordPress host.

Affected Products

• PenciDesign Soledad WordPress theme versions up to and including 8.6.8
• WordPress sites using the Soledad theme as the active or parent theme
• Child themes inheriting the vulnerable include logic from Soledad <= 8.6.8

Discovery Timeline

• 2025-09-22 - CVE-2025-59588 published to the National Vulnerability Database
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-59588

Vulnerability Analysis

The Soledad theme constructs the path of an include or require statement using attacker-controllable input without sufficient validation. Because the value flows directly into a PHP file-inclusion call, an authenticated user can substitute an arbitrary local path. PHP then parses and executes the targeted file in the context of the web server process. Attackers commonly chain LFI with log poisoning, session file injection, or pre-staged uploads to escalate to remote code execution. The flaw maps to CWE-98, the canonical weakness behind PHP Remote and Local File Inclusion bugs.

Root Cause

The root cause is missing or insufficient sanitization of a filename parameter that is passed to a PHP include, include_once, require, or require_once statement. The theme does not restrict the value to an allowlist of expected templates, nor does it normalize path traversal sequences such as ../. As a result, the inclusion logic resolves outside the intended template directory.

Attack Vector

The attack vector is network-based and requires authentication with low privileges, such as a subscriber-level account on sites that permit registration. An attacker submits an HTTP request to the vulnerable Soledad endpoint with a crafted parameter that points at a sensitive local file or a previously planted payload. The web server then includes the referenced file in the response context, exposing its contents or executing any embedded PHP. The vulnerability does not require user interaction beyond the attacker's own session.

No verified public proof-of-concept code is available. See the Patchstack Vulnerability Report for the underlying advisory.

Detection Methods for CVE-2025-59588

Indicators of Compromise

• HTTP requests to Soledad theme endpoints containing path traversal sequences such as ../, ..%2f, or absolute paths like /etc/passwd or wp-config.php in query or POST parameters
• Web server access logs showing authenticated low-privilege users repeatedly probing parameters that map to template or layout filenames
• Unexpected PHP errors referencing include(), require(), or failed to open stream originating from files under wp-content/themes/soledad/
• New or modified PHP files in writable locations such as wp-content/uploads/ correlating with subsequent inclusion requests

Detection Strategies

• Inspect WordPress request logs for parameter values that resolve outside the active theme directory or contain encoded traversal characters
• Hunt for sequences where an authenticated subscriber account accesses theme files normally reached only by administrators
• Correlate PHP include warnings in error_log with the requesting IP and authenticated user identifier

Monitoring Recommendations

• Enable verbose PHP error logging and forward error_log events to a central SIEM for correlation
• Monitor file integrity on wp-content/themes/soledad/ and on upload directories that the web server can read
• Alert on creation of any newly registered low-privilege accounts followed by requests to theme PHP files

How to Mitigate CVE-2025-59588

Immediate Actions Required

• Update the PenciDesign Soledad theme to a release later than 8.6.8 once the vendor publishes a fixed version
• Audit all WordPress user accounts and remove or downgrade unused low-privilege accounts that could be abused for authenticated exploitation
• Disable open user registration on sites where it is not strictly required
• Review web server and PHP logs for prior exploitation attempts dating back to before the patch was applied

Patch Information

Refer to the Patchstack Vulnerability Report for the latest patch status and fixed version information from PenciDesign. Apply the vendor-supplied update through the WordPress theme update mechanism and verify the installed version after upgrade.

Workarounds

• Deploy a Web Application Firewall (WAF) rule to block requests containing path traversal patterns or absolute file paths in parameters destined for Soledad theme endpoints
• Set open_basedir in PHP configuration to restrict file inclusion to the WordPress installation directory
• Set allow_url_include = Off and allow_url_fopen = Off in php.ini to prevent remote inclusion variants
• Restrict file permissions so the PHP process cannot read sensitive system files outside the web root

# Example php.ini hardening to limit file inclusion scope
allow_url_include = Off
allow_url_fopen = Off
open_basedir = "/var/www/html:/tmp"