How severe is CVE-2023-6875?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-6875 known to be exploited?

7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Saadiqbal Post Smtp – Complete Email Deliverability And Solution With Logs, Alerts, Backup & Mobile App

CVE-2023-6875

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.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2024-01-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.903 (99.8th percentile), scored 2026-10-15.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.903 · newest: 0.903 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

www.wordfence.com/threat-intel/vulnerabilities/id/e675d64c-cbb8-4f24-9b6f-2597a… (Third Party Advisory)
plugins.trac.wordpress.org/browser/post-smtp/trunk/Postman/Mobile/includes/rest… (Issue Tracking)
plugins.trac.wordpress.org/changeset/3016051/post-smtp/trunk (Product)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory, VDB Entry)

Frequently asked questions

What is CVE-2023-6875?: CVE-2023-6875 is a critical-severity vulnerability in Saadiqbal Post Smtp – Complete Email Deliverability And Solution With Logs, Alerts, Backup & Mobile App, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.8/10. Published 2024-01-11.
How severe is CVE-2023-6875?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-6875 known to be exploited?: 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.