Gravity SMTP <= 2.1.4 - Unauthenticated Sensitive Information Exposure via REST API
| CVE | CVE-2026-4020 |
|---|---|
| CVSS | 5.3 (Medium) |
| Publicly Published | March 30, 2026 |
| Last Updated | May 13, 2026 |
| Researcher |
Osvaldo Noe Gonzalez Del Rio (Os)
- krei.dev | ogbuilders.io
|
Description
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.
Wordfence blocked 751,926 attacks targeting this vulnerability in the past 24 hours.
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Vulnerability Details for Gravity SMTP
| Software Type | Plugin |
|---|---|
| Software Slug | gravitysmtp |
| Patched? | Yes |
| Remediation | Update to version 2.1.5, or a newer patched version |
| Affected Version |
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| Patched Version |
|
Recent vulnerabilities in Gravity SMTP
| # | Title | CVE ID | CVSS | Researchers | Date |
|---|---|---|---|---|---|
| 1 | Gravity SMTP <= 2.1.4 - Missing Authorization to Authenticated (Subscriber+) Plugin Uninstall | CVE-2026-4162 | Osvaldo Noe Gonzalez Del Rio (Os) | April 9, 2026 |
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