CVE-2023-6875 Auth bypass in Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
Unauthenticated attackers can bypass authorization via type juggling to reset API keys and view logs, potentially leading to site takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-6875?
CVE-2023-6875 is a critical authentication bypass vulnerability in saadiqbal Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App, published on 11 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2023-6875?
It affects 1 product.
Products include Wpexperts Post Smtp.
How do I fix CVE-2023-6875?
No fix has been published for CVE-2023-6875 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2023-6875 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-6875 exists.
Public exploit code: 1 Metasploit module, 1 Nuclei template and 3 proofs of concept on GitHub.
Other vulnerabilities in saadiqbal Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
- CVE-2023-3179 POST SMTP Mailer < 2.5.7 - Account Takeover via CSRF
- CVE-2023-52233 WordPress POST SMTP Mailer plugin <= 2.8.6 - Broken Access Control on API vulnerability
- CVE-2024-52436 WordPress Post SMTP plugin <= 2.9.9 - SQL Injection vulnerability
- CVE-2025-0521 Post SMTP <= 3.0.2 - Unauthenticated Stored Cross-Site Scripting
- CVE-2024-5207 SQL injection in Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
Sources
Also known as GHSA-9cw8-p5p2-35pf.