Name: CVE-2026-27064: Unrestricted Upload of File with Dangerous Type
Creator: Rapid7
Published: 2026-07-23T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-27064, CWE-434, CVSS 9.1, EPSS 0.00499

Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.

CVSS Details

CVSS 3.1 Base Score: 9.1
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Mailster Plugin	—	Update mailster plugin to version 4.1.18, or a newer patched version	Jul 30, 2026	Jul 22, 2026

Prioritise with Active Threat Intelligence

With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.

Explore Intelligence Hub

MDR Buyer's Guide

Global Threat Landscape Report

Grow your business

CVSS Details

Covered by Rapid7

Prioritise with Active Threat Intelligence