Mailrelay

Mailrelay has one disclosed vulnerability in the WordSec catalog, all reported in 2023; it is fixed as of September 2026. Their average CVSS score is 4.3, and the most serious one scores 4.3 out of 10.

The most common weakness is Cross-Site Request Forgery (CSRF), behind 1 of the records (100%).

The one issue recorded for Mailrelay has a vendor fix available, so running the current release closes it.

All of these findings were reported by Kévin Mosbahi (Mika). Mailrelay is installed on roughly 1,000 WordPress sites, so each unpatched flaw has a wide blast radius. The current release is tested up to WordPress 7.0.4.

Strategic Overview

Avg CVSSMedium

4.3/ 10

Patch Coverage100%

Open

Fixed

Get automatic notifications for all Mailrelay vulnerabilities before they are exploited.

Highest severity on recordCVSS 4.3CVE-2023-45108

Mailrelay <= 2.1.1 - Cross-Site Request Forgery via render_admin_page

Read the full analysis

Vulnerability Records

1 records


2023-10-06 00:00	Mailrelay <= 2.1.1 - Cross-Site Request Forgery via render_admin_page Mailrelay <= 2.1.1	`CVE-2023-45108`	4.3 Medium	Kévin Mosbahi (Mika)	Yes

Showing 1–1 of 1 reports

Plugin Profile

Latestv3.0.2

Mailrelay

Author

mailrelay

4.2(5)

84/100

Last Updated

2026-07-27 (2mo ago)

Active Installs

1,000+

Downloads

36,057

Requires WP

5.0+

Requires PHP

Tested up to

WP 7.0.4

Created

2013-01-23 (14y ago)

This plugin allows you to sync all WordPress users with one or more groups in Mailrelay allowing your website users to receive newsletters, notifications etc. Configuration Once the extension is installed you will have a new settings option: Mailrelay -> Authentication At this page, you will need to fill in the following data: Account API Key The Account information can be found in your Mailrelay’s welcome email. And your API Key can be created at your Mailrelay account under settings -> API Keys Once this data is successfully saved you can run the user sync.

View on WordPress.org