CVE-2026-111832

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

10.0 Critical

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.40%Unchanged since Oct 22, 2026

What each source reports

CVE List Score used 10.0

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

Record: CVE-2026-111832
CVSS 3.1: 10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

EUVDEUVD-2026-107282 10.0

Record: EUVD-2026-107282
CVSS 3.1: 10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-2hrr-86cg-w5v9 10.0

Unrestricted Upload of File with Dangerous Type vulnerability in WP Mailster WP Mailster wp...

Record: GHSA-2hrr-86cg-w5v9
CVSS 3.1: 10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

NVD 10.0

Record: CVE-2026-111832
CVSS 3.1: 10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-111832 is a critical vulnerability (CVSS 10.0) in Brandtoss Wp Mailster, published October 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 35th percentile. No source names a fixed version.