CVE-2026-28570: Vavo Core Path Traversal Vulnerability

CVE-2026-28570 Overview

CVE-2026-28570 is an unauthenticated Local File Inclusion (LFI) vulnerability affecting the Vavo Core WordPress plugin in versions <= 2.3.0. The flaw is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). Remote attackers can include arbitrary local files through the vulnerable plugin without authentication. Successful exploitation can lead to disclosure of sensitive configuration files, session material, and in some environments, arbitrary code execution when a controllable file is included.

Critical Impact
Unauthenticated remote attackers can include arbitrary local files on WordPress sites running Vavo Core <= 2.3.0, exposing credentials and enabling potential code execution.

Affected Products

Vavo Core WordPress plugin, all versions up to and including 2.3.0
WordPress installations with the Vavo Core plugin enabled
Hosting environments serving PHP through the affected plugin path

Discovery Timeline

2026-08-18 - CVE-2026-28570 published to the National Vulnerability Database (NVD)
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-28570

Vulnerability Analysis

The vulnerability is a PHP Local File Inclusion issue in the Vavo Core plugin. The plugin passes attacker-controlled input into a PHP include or require statement without validating that the resolved path stays inside an allow-listed directory. Because the affected endpoint does not require authentication, any remote client that can reach the WordPress site can trigger the include operation.

An attacker can traverse the filesystem using ../ sequences or supply an absolute path to load PHP files or readable configuration files. Reading wp-config.php exposes database credentials, authentication keys, and salts. If the site accepts file uploads or writes attacker-controlled content to a predictable path, the LFI primitive can be chained into remote code execution.

Root Cause

The root cause is improper control of a filename used in a PHP include statement, tracked as CWE-98. User-supplied input reaches the include sink without canonicalization, extension enforcement, or an allow list of permitted files.

Attack Vector

Exploitation is network-based and requires no privileges or user interaction. An attacker sends a crafted HTTP request to the vulnerable plugin endpoint, supplying a path traversal string or absolute filesystem path in the parameter that feeds the include statement. See the Patchstack advisory for Vavo Core for parameter-level details.

No public proof-of-concept exploit code is available at the time of publication, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-28570

Indicators of Compromise

HTTP requests to Vavo Core plugin endpoints under /wp-content/plugins/vavo-core/ containing ../, URL-encoded %2e%2e%2f, or php:// wrappers in query parameters
Web server access logs showing unauthenticated requests that reference sensitive paths such as wp-config.php, /etc/passwd, or /proc/self/environ
PHP error log entries reporting failed include/require calls with unexpected filesystem paths
New or modified PHP files under wp-content/uploads/ following suspicious plugin requests

Detection Strategies

Deploy WordPress-aware web application firewall (WAF) rules that block path traversal sequences and PHP stream wrappers targeting the Vavo Core plugin path
Correlate plugin request patterns with subsequent reads of sensitive files or spawning of PHP worker processes executing unexpected scripts
Monitor for outbound connections from PHP-FPM or the web server user immediately following requests to the vulnerable plugin

Monitoring Recommendations

Enable verbose access logging on WordPress hosts and forward logs to a centralized analytics platform for retention and correlation
Alert on unauthenticated requests to plugin PHP files that include suspicious query parameters referencing filesystem paths
Track integrity of wp-config.php and other high-value files with file integrity monitoring

How to Mitigate CVE-2026-28570

Immediate Actions Required

Update the Vavo Core plugin to a version newer than 2.3.0 as soon as a fixed release is published by the vendor
If no patched version is available, deactivate and remove the Vavo Core plugin from all affected WordPress sites
Rotate WordPress database credentials, authentication keys, and salts in wp-config.php if exploitation is suspected
Review access logs for prior exploitation attempts against the plugin endpoint

Patch Information

Refer to the Patchstack advisory for Vavo Core for the latest patched version and vendor guidance. Apply the fix through the WordPress plugin update mechanism and verify the installed version reports higher than 2.3.0.

Workarounds

Restrict access to /wp-content/plugins/vavo-core/ at the web server or WAF layer until a patched version is installed
Configure PHP with open_basedir restrictions to limit filesystem reads to the WordPress document root
Disable PHP stream wrappers such as allow_url_include and constrain allow_url_fopen in php.ini
Enforce least-privilege file permissions on wp-config.php and other sensitive files served by the PHP worker

bash

# Configuration example: harden php.ini against LFI exploitation
allow_url_include = Off
allow_url_fopen = Off
open_basedir = "/var/www/html:/tmp"