Reported vulnerability
Gravity SMTP <= 2.1.4 - Unauthenticated Sensitive Information Exposure via REST API
Published 30 Mar 2026
Updated 13 May 2026
CVE-2026-4020
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Does this affect my version?
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Wordfence advisory
medium · CVSS 5.3The 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.
Severity vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Gravity SMTP
- Software
- plugin · gravitysmtp
- Affected versions
- Start version unspecified, through 2.1.4
- Fix availability
- Fix available
- Fixed versions
- 2.1.5
Recommended action
Update to version 2.1.5, or a newer patched version
Further references (1)
Data sources and licences
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Read licence termsCopyright 1999-2026 The MITRE Corporation
CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
Read licence termsSource: Wordfence
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Get help with this issueQuestions about this vulnerability
Which versions of Gravity SMTP are affected?
Wordfence lists these affected versions: Start version unspecified, through 2.1.4. Use the version checker above to compare your installed release with this report.
Is a fix available for Gravity SMTP?
Wordfence reports a fix for this issue in Gravity SMTP. It lists these fixed versions: 2.1.5. Back up your website and test the recommended update before applying it to your live site.
Where can I find my installed plugin version?
In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.
Does an affected version mean my website has been hacked?
An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.
Other reports for the same product
These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.