CVE-2026-27064criticalCWE-434

CVE-2026-27064: critical vulnerability in EverPress Mailster

WordPress Mailster plugin <= 4.1.17 - Arbitrary File Upload vulnerability

Published

Follow this CVE+ Monitor Mailster

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.1epss 0.5%
Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
EverPress · Mailster
Related CVEs — EverPress Mailster

In the same product, most dangerous first.

CVE-2024-32523HIGHWordPress Mailster plugin <= 4.0.6 - Unauthenticated Local File Inclusion vulnerabilityEPSS 1.8%CVE-2024-30503HIGHWordPress Mailster plugin <= 4.0.6 - Reflected Cross Site Scripting (XSS) vulnerabilityEPSS 0.4%CVE-2024-37433HIGHWordPress Mailster plugin <= 4.0.9 - Reflected Cross Site Scripting (XSS) vulnerabilityEPSS 0.3%CVE-2025-64203HIGHWordPress Mailster plugin < 4.1.14 - Cross Site Scripting (XSS) vulnerabilityEPSS 0.2%