CVE-2026-40727: Arbitrary File Access in Groundhogg CRM

The primary impact of CVE-2026-40727 is the potential for remote code execution. An attacker, having gained Custom-level access within the Groundhogg plugin, can leverage the insufficient file path validation to delete any file accessible to the WordPress process. A particularly dangerous scenario involves deleting the wp-config.php file, which contains sensitive database credentials and configuration settings. Deletion of this file effectively disables the WordPress site and allows the attacker to potentially reconstruct it with malicious code. The ease of exploitation, combined with the potential for complete site compromise, makes this a high-priority vulnerability. This vulnerability shares similarities with other file deletion vulnerabilities where improper validation allows for unauthorized file manipulation.

1. Published2026-04-16
2. Modified2026-04-21

The primary mitigation for CVE-2026-40727 is to immediately upgrade the Groundhogg plugin to version 4.4.1 or later. If upgrading is not immediately feasible due to compatibility issues or breaking changes, consider restricting file permissions on the WordPress server to minimize the potential impact of a successful attack. While not a complete solution, implementing a Web Application Firewall (WAF) with rules to block suspicious file deletion requests can provide an additional layer of defense. Monitor WordPress access logs for unusual file deletion attempts, particularly targeting critical files like wp-config.php. After upgrading, verify the fix by attempting to access and delete a non-critical file through the plugin's interface to confirm that file path validation is now properly enforced.

Active installs

2KPopular

Plugin rating

4.9

Requires WordPress

5.9+

Compatible up to

6.9.4

Requires PHP

7.1+