CVE-2023-6875criticalobserved exploitationCWE-639CWE-862

CVE-2023-6875: critical vulnerability in saadiqbal Post SMTP – Complete Email…

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

Published · Updated

Follow this CVE+ Monitor Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

100Vexday Risk Score

Patch now. It exploitation observed by VulnCheck and has a working public exploit.

ssvc Actcvss 9.8epss 90%
from disclosure to weapon2 days
Published on NVDJan 11
1st PoC+2d
metasploitJan 10
VulnCheckJan 10
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
saadiqbal · Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — saadiqbal Post SMTP – Complete Email…

In the same product, most dangerous first.

CVE-2025-11833CRITICALPost SMTP – Complete SMTP Solution with Logs, Alerts, Backup SMTP & Mobile App <= 3.6.0 - Missing Authorization to Account Takeover via Unauthenticated Email Log DisclosureEPSS 61.5%CVE-2023-7027HIGHPOST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress <= 2.8.7 - Unauthenticated Stored Cross-Site Scripting via deviceEPSS 0.9%CVE-2021-4422MEDIUMPOST SMTP Mailer <= 2.0.20 - Cross-Site Request Forgery BypassEPSS 0.5%CVE-2023-3082HIGHPost SMTP <= 2.5.7 - Unauthenticated Stored Cross-Site Scripting via EmailEPSS 0.5%CVE-2024-5207HIGHPOST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress <= 2.9.3 - Authenticated (Administrator+) SQL InjectionEPSS 0.5%CVE-2023-6629MEDIUMPOST SMTP Mailer <= 2.8.6 - Reflected Cross-Site Scripting via msgEPSS 0.4%