Hackers Exploit Gravity SMTP WordPress Plugin Bug to Expose API Keys

The Hacker News

June 20, 2026 at 9:56 AM

Actively Exploited

CVE Exploit Vulnerability Update Critical

Overview

Hackers are taking advantage of a recently patched vulnerability in the Gravity SMTP plugin for WordPress, which is used on around 100,000 websites. This security flaw, identified as CVE-2026-4020, allows attackers without authentication to access sensitive information, including API keys and OAuth tokens. The vulnerability has a medium severity score of 5.3, but the potential exposure of critical data makes it a significant concern for site administrators. Users of the Gravity SMTP plugin need to ensure they update to the latest version to protect their sites from these attacks. The urgency of addressing this issue is heightened by the fact that the vulnerability is currently being exploited in the wild.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Gravity SMTP WordPress plugin, approximately 100,000 sites affected.
Action Required: Users should update to the latest version of the Gravity SMTP plugin to mitigate the vulnerability.
Timeline: Newly disclosed

Original Article Summary

Threat actors are exploiting a recently patched security flaw impacting Gravity SMTP, a WordPress plugin that's installed on about 100,000 sites. The vulnerability, tracked as CVE-2026-4020 (CVSS score: 5.3), is a medium-severity information disclosure flaw that can allow unauthenticated attackers to extract sensitive data, such as configuration data, API keys, secrets, and OAuth tokens

Impact

Gravity SMTP WordPress plugin, approximately 100,000 sites affected.

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Users should update to the latest version of the Gravity SMTP plugin to mitigate the vulnerability. Regularly check for updates and apply security patches promptly.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Exploit, Vulnerability, and 2 more.

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