WordPress POST SMTP Mailer - Authorization Bypass (CVE-2023-6875)

CVE-2023-6875 is a critical vulnerability in the POST SMTP Mailer plugin for WordPress, which allows threat actors to gain unauthorized access and modify sensitive data within WordPress installations.

CrowdSec has been tracking this vulnerability and its exploits since 1st of April 2025.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2023-6875 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2023-6875 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2023-6875 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.

Exploitation attempts commonly target URLs containing /wp-json/post-smtp/v1/connect-app.