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

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.

Affected

saadiqbal · Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App

CVSS v3.1 NVD

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

90.34% chance of exploitation in the next 30 days, 100th percentile

Nuclei

critical · CWE-862

Published

2024-01-11

Updated

2026-04-08

Proof-of-concept exploits (3)

• UlyssesSaicha/CVE-2023-687525★ · 2024-01-15
• gbrsh/CVE-2023-68756★ · 2024-01-27
• hatlesswizard/CVE-2023-68751★ · 2024-02-05

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-6875.yaml

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/auxiliary/admin/http/wp_post_smtp_acct_ta…

Security advisories

• http://packetstormsecurity.com/files/176525/WordPress-POST-SMTP-Mailer-2.8.7-Authorizatio…
• https://www.wordfence.com/threat-intel/vulnerabilities/id/e675d64c-cbb8-4f24-9b6f-2597a97…
• https://plugins.trac.wordpress.org/changeset/3016051/post-smtp/trunk?contextall=1&old=301…
• https://plugins.trac.wordpress.org/browser/post-smtp/trunk/Postman/Mobile/includes/rest-a…

References

• CVE Record
• NVD entry

Related

• CVE-2021-4034
• CVE-2022-29464
• CVE-2022-46836
• CVE-2022-48321
• CVE-2023-22974
• CVE-2023-28121