CVE-2026-4020

CVE-2026-4020 has been observed exploited in the wild (reported by VulnCheck KEV). EIP tracks 2 public exploits from researchers including faizdotid, HORKimhab. A Nuclei detection template is also available.

AI-analyzed exploit summary This repository contains a scanner for CVE-2026-4020, which targets the Gravity SMTP plugin's unauthenticated sensitive information exposure vulnerability. The scanner checks for the presence of specific markers in the JSON response from the vulnerable endpoint to determine if the target is affected.

The Gravity SMTP plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 2.1.4. This is due to a REST API endpoint registered at /wp-json/gravitysmtp/v1/tests/mock-data with a permission_callback that unconditionally returns true, allowing any unauthenticated visitor to access it. When the ?page=gravitysmtp-settings query parameter is appended, the plugin's register_connector_data() method populates internal connector data, causing the endpoint to return approximately 365 KB of JSON containing the full System Report. This makes it possible for unauthenticated attackers to retrieve detailed system configuration data including PHP version, loaded extensions, web server version, document root path, database server type and version, WordPress version, all active plugins with versions, active theme, WordPress configuration details, database table names, and any API keys/tokens configured in the plugin.