Critical 9.1Published Jul 23, 2026

CVE-2026-27064WordPress Mailster plugin <= 4.1.17 - Arbitrary File Upload vulnerability

Updated under an hour ago (Oct 26, 2026, 5:30 PM ET)

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It affects EverPress Mailster. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for EverPress Mailster

Exploited in the last 30 days

Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.

CVSS: 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-434
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Patchstack
NVD analysis: Deferred
Record last updated: Jul 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

EverPress Mailster everpress:mailster (from the name)	from n/a through 4.1.17; fixed at 4.1.18	CNA record

References

References

https://patchstack.com/database/wordpress/plugin/mailster/vulnerability/wordpress-mailster-plugin-4-1-17-arbitrary-file-upload-vulnerability?_s_id=cve	vdb-entry

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.