🔐 CVE Alert

CVE-2026-27064

CRITICAL 9.1

WordPress Mailster plugin <= 4.1.17 - Arbitrary File Upload vulnerability

CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th

Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.

CWE CWE-434
Vendor everpress
Product mailster
Published Jul 23, 2026
Last Updated Jul 23, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Affected Versions

EverPress / Mailster
n/a ≤ 4.1.17

References

NVD ↗ CVE.org ↗ EPSS Data ↗
patchstack.com: https://patchstack.com/database/wordpress/plugin/mailster/vulnerability/wordpress-mailster-plugin-4-1-17-arbitrary-file-upload-vulnerability?_s_id=cve

Credits

Phat RiO | Patchstack Bug Bounty Program