CVE-2026-40769 Overview
CVE-2026-40769 is an unauthenticated arbitrary file deletion vulnerability in the Contact Form Extender for Divi – Save Entries, File Upload & Country Code Field WordPress plugin. The flaw affects versions up to and including 1.0.6. An unauthenticated remote attacker can delete arbitrary files on the underlying server through a path traversal weakness [CWE-22]. Deleting critical files such as wp-config.php can force WordPress into setup mode, enabling site takeover. The vulnerability requires no authentication and no user interaction.
Critical Impact
Unauthenticated attackers can delete arbitrary files on the server over the network, leading to denial of service and potential full site compromise when configuration files are removed.
Affected Products
- Contact Form Extender for Divi – Save Entries, File Upload & Country Code Field WordPress plugin
- Versions 1.0.6 and earlier
- WordPress sites using the Divi Builder with this plugin installed
Discovery Timeline
- 2026-06-15 - CVE-2026-40769 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-40769
Vulnerability Analysis
The vulnerability is a path traversal flaw [CWE-22] that permits arbitrary file deletion without authentication. The plugin exposes file handling functionality, likely tied to its file upload or saved entries features, that accepts user-controlled file path input. The input is passed to a deletion routine without sufficient validation or canonicalization. Attackers supply traversal sequences such as ../ to escape the intended directory and reference files anywhere the web server process has write access.
The attack is network-based and requires no privileges or user interaction. The scope is changed because deletion impacts resources outside the plugin's intended security boundary. Refer to the Patchstack Vulnerability Report for additional technical context.
Root Cause
The root cause is missing or insufficient validation of file path parameters supplied to a file deletion handler. The plugin fails to enforce an allowlist of deletable files, does not restrict paths to a specific upload directory, and does not block traversal characters. Combined with a missing authentication or capability check on the endpoint, this allows any anonymous visitor to invoke the deletion routine.
Attack Vector
An attacker sends a crafted HTTP request to the vulnerable plugin endpoint containing a path traversal payload referencing the target file. Deleting wp-config.php triggers WordPress to display the installation wizard, allowing an attacker to reconfigure the site against an attacker-controlled database. Verified exploit code is not publicly available at this time.
No verified exploit code is publicly available. See the Patchstack advisory linked above for additional details.
Detection Methods for CVE-2026-40769
Indicators of Compromise
- Missing or recently deleted wp-config.php, .htaccess, or core WordPress files on the host
- Unexpected appearance of the WordPress installation setup page when visiting the site root
- HTTP requests to plugin endpoints containing ../ sequences or absolute file paths in parameter values
- Web server access logs showing anonymous POST or GET requests to Contact Form Extender for Divi endpoints followed by 200 responses and subsequent site errors
Detection Strategies
- Monitor web access logs for requests targeting /wp-content/plugins/contact-form-extender-for-divi-builder/ containing traversal patterns
- Deploy Web Application Firewall rules that block path traversal sequences in request parameters
- Implement file integrity monitoring on the WordPress installation directory to alert on deletion of core files
Monitoring Recommendations
- Forward web server and PHP error logs to a centralized logging platform for correlation with file deletion events
- Alert on sudden absence of wp-config.php or transitions to the WordPress setup screen
- Track plugin inventory across WordPress estates to identify hosts running vulnerable versions <= 1.0.6
How to Mitigate CVE-2026-40769
Immediate Actions Required
- Identify all WordPress instances running Contact Form Extender for Divi version 1.0.6 or earlier
- Disable or remove the plugin until a patched version is available and installed
- Restrict access to the plugin's endpoints at the web server or WAF layer
- Back up wp-config.php and core configuration files to enable rapid recovery
Patch Information
No fixed version is referenced in the available advisory data at the time of publication. Monitor the Patchstack Vulnerability Report and the plugin vendor for an updated release addressing CVE-2026-40769.
Workarounds
- Deactivate and delete the plugin from affected WordPress installations until a fix is published
- Apply WAF rules blocking requests containing ../, ..\\, or null byte sequences in parameters destined for the plugin
- Restrict filesystem permissions so the web server user cannot delete critical files such as wp-config.php
- Enable virtual patching through Patchstack or an equivalent WordPress-aware protection service
# Example WAF rule fragment to block traversal in plugin requests
SecRule REQUEST_URI "@contains contact-form-extender-for-divi-builder" \
"chain,deny,status:403,id:1040769,msg:'Block path traversal in vulnerable Divi plugin'"
SecRule ARGS "@rx \.\./" "t:none"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
