---
id: CVE-2026-111832
title: WordPress WP Mailster plugin <= 1.9.1.0 - Arbitrary File Upload vulnerability
summary: >-
  Unrestricted Upload of File with Dangerous Type vulnerability in WP Mailster
  WP Mailster wp-mailster allows Upload a Web Shell to a Web Server.This issue
  affects WP Mailster: from n/a through 1.9.1.0.
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-434
vendor: WP Mailster
product: wp-mailster
affected:
  - wp-mailster <= 1.9.1.0
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-21T15:27:09.873855Z'
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T17:19:12.429Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111832'
references:
  - url: >-
      https://patchstack.com/database/wordpress/plugin/wp-mailster/vulnerability/wordpress-wp-mailster-plugin-1-9-1-0-arbitrary-file-upload-vulnerability?_s_id=cve
tags:
  - cve.org
ingestedAt: '2026-10-21T15:02:42.105Z'
---

## Overview

Unrestricted Upload of File with Dangerous Type vulnerability in WP Mailster WP Mailster wp-mailster allows Upload a Web Shell to a Web Server.This issue affects WP Mailster: from n/a through 1.9.1.0.

## Affected

- `wp-mailster <= 1.9.1.0`

## Remediation

Update the WordPress WP Mailster plugin to the latest available version (at least 1.9.2.0).