CVE-2026-39661: Magentech SW Core Path Traversal Flaw

CVE-2026-39661 Overview

CVE-2026-39661 is a PHP Local File Inclusion (LFI) vulnerability in the Magentech SW Core WordPress plugin. The flaw stems from improper control of filename parameters used in PHP include or require statements, categorized as [CWE-98]. Attackers with low privileges can leverage the issue to load arbitrary local PHP files, leading to disclosure of sensitive data and potential code execution within the WordPress runtime.

The vulnerability affects all SW Core releases up to and including version 1.7.18. The issue is exploitable over the network and impacts confidentiality, integrity, and availability of the host application.

Critical Impact
Authenticated attackers can include arbitrary local PHP files through the SW Core plugin, exposing sensitive site data and enabling code execution paths within the WordPress process.

Affected Products

Magentech SW Core plugin for WordPress
All versions from initial release through 1.7.18
WordPress sites using SW Core for ShopWise or related Magentech themes

Discovery Timeline

2026-05-26 - CVE-2026-39661 published to NVD
2026-05-26 - Last updated in NVD database

Technical Details for CVE-2026-39661

Vulnerability Analysis

The SW Core plugin passes user-controlled input into a PHP file inclusion statement without adequate validation or sanitization. When a request reaches a vulnerable endpoint, the plugin constructs a file path from request parameters and supplies it to include or require. PHP then resolves and executes the referenced file inside the WordPress process context.

Because the inclusion target is not restricted to a safe allow-list of files or a known base directory, an authenticated attacker can traverse the filesystem and load arbitrary .php files reachable by the web server user. This includes WordPress configuration files, plugin internals, and any uploaded PHP content the attacker can place on the host. The result is information disclosure and, in many deployments, full code execution within the application.

Root Cause

The root cause is improper control of a filename used in a PHP include or require statement [CWE-98]. The plugin trusts attacker-supplied input to determine which file to include rather than mapping requests to a fixed set of vetted paths. Missing path normalization and the absence of strict allow-list validation allow directory traversal sequences and absolute paths to reach the include call.

Attack Vector

The attack vector is network-based and requires low privileges, meaning the attacker must hold an authenticated session on the WordPress instance. Attack complexity is high, indicating the attacker must satisfy specific conditions such as a valid nonce, request flow, or plugin state before the vulnerable code path is reachable. No user interaction is required once those conditions are met. Successful exploitation impacts confidentiality, integrity, and availability of the application.

Refer to the Patchstack Vulnerability Advisory for additional technical context.

Detection Methods for CVE-2026-39661

Indicators of Compromise

HTTP requests to SW Core plugin endpoints containing directory traversal sequences such as ../, ..%2f, or absolute paths in query or POST parameters
Unexpected reads of wp-config.php, /etc/passwd, or files outside the plugin directory by the PHP-FPM or Apache worker process
Web server access logs showing authenticated sessions invoking SW Core actions with file-like parameter values ending in .php
New or unexpected PHP files appearing in wp-content/uploads/ followed by inclusion attempts referencing those paths

Detection Strategies

Inspect WordPress access logs for requests targeting SW Core handlers with parameters that resemble filesystem paths or contain encoded traversal characters
Enable PHP open_basedir violation logging and alert on entries originating from the SW Core plugin directory
Deploy a web application firewall rule that blocks include-style parameters carrying path separators or null bytes against the plugin's endpoints
Compare installed SW Core version against 1.7.18 across all managed WordPress sites and flag instances at or below that version

Monitoring Recommendations

Forward WordPress, PHP, and web server logs to a centralized analytics platform and retain them for at least 90 days
Monitor file integrity on wp-content/plugins/sw_core/ and wp-content/uploads/ for unauthorized PHP file writes
Alert on outbound network connections initiated by the PHP process to non-standard destinations following SW Core requests

How to Mitigate CVE-2026-39661

Immediate Actions Required

Identify every WordPress site running SW Core at version 1.7.18 or earlier and treat them as exposed until updated
Apply the vendor patch as soon as a fixed release is published by Magentech
Restrict authenticated access to low-privilege accounts and rotate credentials for any contributors or subscribers that are no longer needed
Review server logs for prior exploitation attempts referencing SW Core endpoints with path-like parameters

Patch Information

Magentech has not published a fixed version identifier in the referenced advisory at the time of CVE publication. Monitor the Patchstack Vulnerability Advisory for the official fixed release. Upgrade SW Core to the patched version immediately once it becomes available.

Workarounds

Deactivate the SW Core plugin until a patched release is installed if the affected functionality is not business-critical
Configure a virtual patch in a WAF to block path traversal sequences and .php values within SW Core request parameters
Set PHP open_basedir to restrict file inclusion to the WordPress installation directory, limiting traversal beyond the web root
Disable the allow_url_include directive and confirm allow_url_fopen is set to Off in php.ini

bash

# Configuration example - php.ini hardening
allow_url_include = Off
allow_url_fopen = Off
open_basedir = "/var/www/html:/tmp"
disable_functions = "exec,passthru,shell_exec,system,proc_open,popen"