# CVE-2023-6875: WordPress POST SMTP Mailer - Authorization Bypass

> Live exploitation tracking for CVE-2023-6875 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2023-6875

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 9.8
- **Public exploit available:** Yes
- **Affected products:** Wpexpertsio Post Smtp – The #1 Wordpress Smtp Plugin With Advanced Email Logging And Delivery Failure Notifications
- **Weaknesses:** CWE-862 (Missing Authorization)
- **Tags:** cms, wordpress

## 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.

## CrowdSec analysis

[CVE-2023-6875](https://euvd.enisa.europa.eu/vulnerability/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`.

## Timeline

- 2024-01-11: CVE Published. CVE-2023-6875 is published to NVD.
- 2025-04-01: Rule Released. CrowdSec releases a rule to detect CVE-2023-6875 exploitation attempts against the CrowdSec Network.
- 2025-04-02: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2023-6875 for the first time.

## References

- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-6875.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2023-6875) follows observed exploitation activity for CVE-2023-6875. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.