CVE-2026-111832 PUBLISHED

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

Assigner: Patchstack
Reserved: 17.10.2026 Published: 21.10.2026 Updated: 21.10.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 10

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	WP Mailster
Product	WP Mailster
Versions	Default: unaffected affected from 0 to 1.9.1.0 (incl.)

Solutions

Update the WordPress WP Mailster plugin to the latest available version (at least 1.9.2.0).

Credits

Peter Tang | Patchstack Bug Bounty Program finder

References

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

Problem Types

Unrestricted Upload of File with Dangerous Type CWE

Impacts

Upload a Web Shell to a Web Server