CVE-2026-27064

WordPress Mailster plugin <= 4.1.17 - Arbitrary File Upload vulnerability

Published Jul 23, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.

Remediation

Vendor Solution

Update the WordPress Mailster Plugin to the latest available version (at least 4.1.18).

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Everpress
Everpress mailster
Wordpress
Wordpress wordpress
Vendors & Products Everpress
Everpress mailster
Wordpress
Wordpress wordpress
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.
Title WordPress Mailster plugin <= 4.1.17 - Arbitrary File Upload vulnerability
Weaknesses CWE-434
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Patchstack
Published
Updated
Jul 23, 2026, 3:02 PM
Reserved
Feb 17, 2026, 1:23 PM
Status
Deferred
Published
Jul 23, 2026, 12:17 PM
Modified
Oct 24, 2026, 1:10 PM