CVE-2026-57709: WooCommerce Membership Path Traversal Flaw

CVE-2026-57709 Overview

CVE-2026-57709 is a path traversal vulnerability in the WP Swings Membership For WooCommerce plugin for WordPress. The flaw affects all versions of the membership-for-woocommerce plugin up to and including 3.1.0. An unauthenticated attacker can send crafted requests over the network to delete arbitrary files on the server. Successful exploitation can remove critical WordPress files such as wp-config.php, which enables site takeover through the reinstallation flow. The vulnerability is tracked as [CWE-22] Improper Limitation of a Pathname to a Restricted Directory.

Critical Impact
Unauthenticated attackers can delete arbitrary files on affected WordPress installations, leading to denial of service and potential site takeover.

Affected Products

WP Swings Membership For WooCommerce plugin versions up to and including 3.1.0
WordPress installations running the membership-for-woocommerce plugin
WooCommerce stores extended with Membership For WooCommerce

Discovery Timeline

2026-07-13 - CVE-2026-57709 published to NVD
2026-07-13 - Last updated in NVD database

Technical Details for CVE-2026-57709

Vulnerability Analysis

The vulnerability resides in file-handling logic within the Membership For WooCommerce plugin. The plugin accepts a file path parameter from a request and passes it to a file deletion routine without properly restricting the path to an allowed directory. Attackers supply traversal sequences such as ../ to escape the intended directory and reference files anywhere on the filesystem accessible to the web server user.

The attack requires no authentication and no user interaction. The scope is changed, meaning the impact extends beyond the vulnerable plugin to the underlying WordPress installation and web server. While confidentiality and integrity are not directly impacted, arbitrary file deletion produces a high availability impact. Deleting wp-config.php triggers the WordPress setup wizard, allowing an attacker to connect the site to an attacker-controlled database and take over administrative access.

The EPSS score is 0.382% with a percentile of 30.5.

Root Cause

The plugin fails to canonicalize and validate user-supplied file paths before invoking filesystem deletion operations. Input sanitization does not strip or reject directory traversal sequences, and no allowlist restricts operations to the plugin's own directory.

Attack Vector

An unauthenticated remote attacker sends an HTTP request to the vulnerable plugin endpoint with a path parameter containing traversal sequences. The plugin resolves the path relative to a base directory and calls unlink() or an equivalent function against the resulting target. The vulnerability manifests without prerequisites. See the Patchstack Arbitrary File Deletion Vulnerability advisory for technical details.

Detection Methods for CVE-2026-57709

Indicators of Compromise

HTTP requests to membership-for-woocommerce endpoints containing ../ or URL-encoded traversal sequences such as %2e%2e%2f
Unexpected deletion of WordPress core files, particularly wp-config.php, .htaccess, or plugin files
Appearance of the WordPress setup wizard on a previously installed site
Web server error logs referencing missing files following anomalous plugin requests

Detection Strategies

Inspect web access logs for AJAX or admin-ajax requests targeting the plugin with path parameters containing traversal characters
Monitor file integrity across the WordPress installation to detect deletions of core, theme, or plugin files
Alert on unauthenticated POST or GET requests to plugin action endpoints originating from unusual source IPs

Monitoring Recommendations

Enable audit logging on the WordPress webroot and alert on deletion events for wp-config.php and other sensitive files
Deploy a web application firewall rule set that blocks directory traversal patterns in query strings and POST bodies
Correlate 500-level responses and subsequent site availability changes with plugin-related request paths

How to Mitigate CVE-2026-57709

Immediate Actions Required

Deactivate the Membership For WooCommerce plugin until a patched version is installed
Restrict access to WordPress admin and AJAX endpoints by source IP where operationally feasible
Back up wp-config.php and the WordPress database before applying updates or changes
Review web server logs for evidence of prior exploitation attempts against the plugin

Patch Information

No fixed version is listed in the referenced advisory at the time of publication. Versions through 3.1.0 are affected. Monitor the Patchstack advisory and the WP Swings vendor channels for a security release, and update immediately when available.

Workarounds

Remove the membership-for-woocommerce plugin directory from wp-content/plugins/ if the plugin is not required
Add WAF signatures to block requests containing ../, ..\, %2e%2e%2f, or %2e%2e/ in parameters targeting the plugin
Enforce filesystem permissions that prevent the web server user from deleting files outside the plugin's own directory

bash

# Example ModSecurity rule to block traversal against the plugin endpoint
SecRule REQUEST_URI "@contains membership-for-woocommerce" \
  "chain,phase:2,deny,status:403,id:1057709,msg:'Path traversal attempt against Membership For WooCommerce'"
  SecRule ARGS "@rx (\.\./|\.\.\\|%2e%2e%2f|%2e%2e/)" "t:none,t:lowercase"