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Mailster vulnerabilities

6 tracked advisories · slug mailster

Important: Mailster appearing in this catalog does not mean your website is affected. Exposure depends on your installed version. How SiteRespond intelligence works

Tracked advisories

6

Latest advisory

22 July 2026

CISA KEV matches

0

In this WordPress feed

WordPress slug

mailster

Plugin

What this means for Mailster

This catalog lists 6 known advisories affecting Mailster. The most recent was published on 22 July 2026. If you use this software, compare your installed version against the affected ranges on each advisory and update to a fixed release outside those ranges. SiteRespond Defence checks your actual installed version when the plugin is connected — listing here does not by itself mean your site is vulnerable.

Latest issues

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

    May allow attackers to run arbitrary code on the server if exploited.

    Published 22 July 2026

  • Mailster < 4.1.14 - Reflected Cross-Site Scripting

    May allow attackers to run scripts in visitors' browsers or hijack admin sessions.

    Published 27 October 2025

  • Mailster <= 4.0.9 - Reflected Cross-Site Scripting

    May allow attackers to run scripts in visitors' browsers or hijack admin sessions.

    Published 28 June 2024

Vulnerability types

  • Cross-site scripting4
  • Remote code execution1

Authentication (inferred from titles)

  • Unauthenticated1
  • Authenticated1
  • Unspecified4

Advisory history

Known Mailster advisories published by month.

All advisories

Check whether your installed version is affected

SiteRespond Defence matches your installed Mailster version against this catalog when the Defence plugin is connected to your WordPress site.

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