CVE-2026-111832

CRITICAL 10.0

WordPress WP Mailster plugin <= 1.9.1.0 - Arbitrary File Upload vulnerability

CVSS Score

10.0

EPSS Score

0.0%

EPSS Percentile

0th

Unrestricted Upload of File with Dangerous Type vulnerability in WP Mailster WP Mailster wp-mailster allows Upload a Web Shell to a Web Server.This issue affects WP Mailster: from n/a through 1.9.1.0.

CWE	CWE-434
Vendor	wp mailster
Product	wp mailster
Published	Oct 21, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

WP Mailster / WP Mailster

0 ≤ 1.9.1.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

patchstack.com: https://patchstack.com/database/wordpress/plugin/wp-mailster/vulnerability/wordpress-wp-mailster-plugin-1-9-1-0-arbitrary-file-upload-vulnerability?_s_id=cve

Credits

Peter Tang | Patchstack Bug Bounty Program