CVE-2025-27015: Hostiko PHP File Inclusion Vulnerability

CVE-2025-27015 Overview

CVE-2025-27015 is a PHP Local File Inclusion (LFI) vulnerability affecting the designingmedia Hostiko WordPress theme. The flaw stems from improper control of filename parameters used in PHP include or require statements [CWE-98]. Authenticated attackers can manipulate file path inputs to load arbitrary local files through the theme's vulnerable code paths. The vulnerability affects all Hostiko theme versions from initial release through version 30.1. Successful exploitation can result in source code disclosure, sensitive configuration file access, and potential PHP code execution when combined with file upload primitives. Patchstack catalogued the issue in its WordPress vulnerability database.

Critical Impact
Authenticated attackers can include arbitrary local PHP files, exposing credentials in wp-config.php and potentially achieving remote code execution through log poisoning or session file inclusion.

Affected Products

designingmedia Hostiko WordPress theme versions through 30.1
WordPress installations running the vulnerable Hostiko theme
Hosting and domain registrar sites built on the Hostiko theme template

Discovery Timeline

2025-03-26 - CVE-2025-27015 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-27015

Vulnerability Analysis

The vulnerability resides in PHP code within the Hostiko theme that accepts user-controlled input and passes it to file inclusion functions without sufficient sanitization. PHP file inclusion functions such as include, include_once, require, and require_once execute the contents of the referenced file as PHP code. When attackers control the filename argument, they can redirect execution flow to unintended files on the server filesystem.

The issue is classified as Local File Inclusion because remote URL inclusion typically requires allow_url_include to be enabled in php.ini, which is disabled by default. However, local inclusion alone is sufficient to read sensitive files and execute attacker-controlled content uploaded through other vectors. The attack requires low privileges, indicating an authenticated user role is needed but not administrative access.

Root Cause

The root cause is missing or inadequate input validation on a request parameter that is concatenated into a file path before being passed to a PHP inclusion function. The theme code does not enforce an allowlist of permitted file names, does not strip directory traversal sequences such as ../, and does not validate that the resolved path remains within an expected directory.

Attack Vector

An authenticated attacker submits a crafted HTTP request containing a manipulated file path parameter to a vulnerable Hostiko endpoint. Traversal sequences in the parameter allow the attacker to escape the intended directory and reference files such as wp-config.php, /etc/passwd, or attacker-controlled files written to predictable locations like the WordPress uploads directory. The included file's contents are interpreted as PHP, enabling code execution when the file contains PHP syntax. Refer to the Patchstack WordPress Vulnerability advisory for additional technical context.

Detection Methods for CVE-2025-27015

Indicators of Compromise

HTTP requests to Hostiko theme PHP files containing directory traversal sequences such as ../ or URL-encoded variants like %2e%2e%2f
Access log entries referencing wp-config.php, /etc/passwd, or PHP session files within request parameters
Unexpected PHP files in the wp-content/uploads/ directory or other writable WordPress locations
Web server processes spawning shells or outbound connections following requests to Hostiko theme endpoints

Detection Strategies

Inspect web server access logs for query parameters containing path traversal patterns targeting theme files under wp-content/themes/hostiko/
Deploy a web application firewall rule that blocks traversal sequences and absolute path references in request parameters
Compare installed theme files against known-good Hostiko distribution hashes to identify tampering

Monitoring Recommendations

Monitor for new or modified PHP files within the WordPress installation, particularly in upload directories
Alert on PHP processes executing commands such as sh, bash, curl, or wget
Track authentication events for low-privilege WordPress accounts followed by requests to theme PHP files

How to Mitigate CVE-2025-27015

Immediate Actions Required

Update the Hostiko WordPress theme to a version later than 30.1 once the vendor publishes a fix
Audit existing WordPress user accounts and remove or disable unused low-privilege accounts that could be leveraged for exploitation
Rotate WordPress database credentials and secret keys in wp-config.php if compromise is suspected
Restrict file system permissions so the web server cannot write to theme or core PHP directories

Patch Information

The vendor advisory is tracked in the Patchstack WordPress Vulnerability database. Hostiko versions through 30.1 are affected; administrators should apply the vendor-supplied update when available and confirm the patched version is installed across all sites using the theme.

Workarounds

Deploy a web application firewall with rules blocking path traversal patterns and inclusion of sensitive filenames
Disable the Hostiko theme and switch to an unaffected theme until a patched version is released
Set open_basedir in PHP configuration to restrict file inclusion to the WordPress document root
Disable allow_url_include and allow_url_fopen in php.ini to prevent remote inclusion escalation

bash

# Configuration example - PHP hardening in php.ini
allow_url_include = Off
allow_url_fopen = Off
open_basedir = "/var/www/html:/tmp"

# Restrict write permissions on theme directory
chmod -R 755 /var/www/html/wp-content/themes/hostiko
chown -R root:www-data /var/www/html/wp-content/themes/hostiko