Vulnerability · Published Oct 21, 2026 · Assigned by Patchstack
CVE-2026-111832WordPress WP Mailster plugin <= 1.9.1.0 - Arbitrary File Upload vulnerability
Critical 10.0
In plain English
A critical-severity unrestricted file upload in WP Mailster from WP Mailster. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).
Severity (CVSS 3.1)10.0Critical
Exploit odds (30 days)0.4%top 65.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| WP Mailster | WP Mailster | 0 – through 1.9.1.0 |
Weakness: CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H