What’s Vulnerable › Vulnerabilities

CVE-2023-6875: POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress <= 2.8.7 - Authorization Bypass via type connect-app API

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 90.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-01-11 · updated 2026-06-17
• Weakness: CWE-639

Description

The POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to unauthorized access of data and modification of data due to a type juggling issue on the connect-app REST endpoint in all versions up to, and including, 2.8.7. This makes it possible for unauthenticated attackers to reset the API key used to authenticate to the mailer and view logs, including password reset emails, allowing site takeover. CVE-2023-52233 appears to be a duplicate of this issue.

Affected products

• saadiqbal Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App: through 2.8.7

References

• https://plugins.trac.wordpress.org/browser/post-smtp/trunk/Postman/Mobile/includes/rest-api/v1/rest-api.php#L60
• https://plugins.trac.wordpress.org/changeset/3016051/post-smtp/trunk?contextall=1&old=3012318&old_path=%2Fpost-smtp%2Ftrunk
• https://www.wordfence.com/threat-intel/vulnerabilities/id/e675d64c-cbb8-4f24-9b6f-2597a97b49af?source=cve
• http://packetstormsecurity.com/files/176525/WordPress-POST-SMTP-Mailer-2.8.7-Authorization-Bypass-Cross-Site-Scripting.html
• https://plugins.trac.wordpress.org/browser/post-smtp/trunk/Postman/Mobile/includes/rest-api/v1/rest-api.php#L60
• https://plugins.trac.wordpress.org/changeset/3016051/post-smtp/trunk?contextall=1&old=3012318&old_path=%2Fpost-smtp%2Ftrunk
• https://www.wordfence.com/threat-intel/vulnerabilities/id/e675d64c-cbb8-4f24-9b6f-2597a97b49af?source=cve

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