CVE-2026-40769: Unauthenticated File Deletion in Contact Form Extender for Divi

Technical summary

CVE-2026-40769 is an unauthenticated arbitrary file deletion vulnerability affecting Contact Form Extender for Divi up to version 1.0.6. The root cause is a path traversal weakness (CWE-22) combined with missing authentication checks on file deletion operations. The vulnerability requires only network access and no user interaction, allowing remote attackers to craft requests that bypass directory restrictions and remove files from the web server. The CVSS 3.1 score of 8.6 (HIGH) reflects the attack's ease of execution and broad scope impact, though confidentiality and integrity are not directly compromised.

Business impact

Website availability becomes the primary concern. Attackers could delete uploaded files, backup data, or configuration files, leading to service disruption, data loss, and operational downtime. For organizations relying on the plugin for contact form submissions and file uploads, this represents a direct threat to business continuity. The lack of authentication requirements means the threat surface includes any internet-connected instance of the plugin, regardless of whether the site is public or behind a network.

Affected systems

Contact Form Extender for Divi plugin versions 1.0.6 and earlier are vulnerable. This includes any WordPress site using the plugin for form handling, file uploads, and country code field functionality. The vulnerability affects all deployment contexts—shared hosting, managed WordPress platforms, and self-hosted environments are equally at risk.

Exploitability

Exploitability is high. The attack vector is network-based, requires no authentication, no special privileges, and no user interaction. An attacker can construct and send a simple HTTP request to trigger file deletion. The low attack complexity means no special conditions or race conditions are needed. Public disclosure or automated scanning tools could rapidly lead to widespread exploitation.

Remediation

Update Contact Form Extender for Divi to a patched version released after 1.0.6. Verify the specific patched version against the vendor's advisory. As an interim measure, restrict HTTP access to the plugin's file deletion endpoints using web application firewall rules or .htaccess directives, and implement file integrity monitoring to detect unauthorized deletions. For critical deployments, consider disabling the plugin entirely until a patch is confirmed available.

Patch guidance

Verify against the vendor advisory for the exact patched version number. Once identified, update the plugin through the WordPress admin dashboard or via manual upload of the patched code. Test the update in a staging environment first to ensure contact form functionality remains intact. After patching, audit file system logs for evidence of deleted files during the vulnerability window.

Detection guidance

Monitor web server logs for unusual HTTP requests to the plugin's file handling endpoints, particularly those containing path traversal sequences (e.g., ../, ..\) or file paths outside expected directories. Set up file integrity monitoring on critical files and directories to alert on unexpected deletions. WordPress security plugins may detect file deletion patterns; enable logging on such tools if available. Review access logs for spikes in requests to plugin directories from unknown sources.

Why prioritize this

This vulnerability merits immediate attention due to its ease of exploitation, unauthenticated attack vector, and direct impact on website availability. The HIGH CVSS score and absence of KEV status should not delay patching; apply updates as soon as a patched version is confirmed available. Organizations using this plugin should prioritize this remediation within their standard patch windows, ideally within 24-48 hours of confirming a patch release.

Risk score, explained

The CVSS 3.1 score of 8.6 (HIGH) reflects: (1) network-based attack vector requiring no authentication or user interaction; (2) low attack complexity; (3) broad scope, as file deletion can impact system-wide availability; and (4) high impact on availability. The score does not include confidentiality or integrity impact because the vulnerability specifically targets file deletion, not data disclosure or modification. In context of real-world risk, organizations running this plugin on production systems face material business continuity threats.

Frequently asked questions