Mailster WordPress Newsletter Plugin

View on WordPress.org

75 Quality Score

Active Installs

Update Freshness

100

User Rating

Support Health

WP Compatibility

100

About

Free WordPress compatibility tester for Mailster. Check your site before buying the premium email newsletter plugin.

Active Installs 7k+

Rating ★★★½ 3.5/5

Last Updated 2026-10-15 10:20am GMT

Requires WordPress 6.0+

Tested Up To 7.1.3

Requires PHP 7.4+

6 known vulnerabilities, all patched

1 Critical 2 High 3 Medium

Most recent: July 22, 2026

View details ▸

Mailster - Email Newsletter Plugin for WordPress <= 4.1.17 - Authenticated (Editor+) Arbitrary File Upload High

July 22, 2026 Patched in ["4.1.18"] CVE-2026-27064

Mailster < 4.1.14 - Reflected Cross-Site Scripting Medium

October 27, 2025 Patched in ["4.1.14"] CVE-2025-64203

Mailster <= 4.0.9 - Reflected Cross-Site Scripting Medium

June 28, 2024 Patched in ["4.0.10"] CVE-2024-37433

Mailster <= 4.0.6 - Unauthenticated Local File Inclusion Critical

April 15, 2024 Patched in ["4.0.7"] CVE-2024-32523

Mailster <= 1.0.3 - Reflected Cross-Site Scripting Medium

March 28, 2024 Patched in ["2.0.0"] CVE-2024-30503

Mailster <= 2.4.5.1 - Stored Cross-Site Scripting High

October 14, 2020 Patched in ["2.4.9"]