Vulnerability · Published Jul 23, 2026 · Assigned by Patchstack
CVE-2026-27064WordPress Mailster plugin <= 4.1.17 - Arbitrary File Upload vulnerability
Critical 9.1
In plain English
A critical-severity unrestricted file upload in Mailster from EverPress. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.5%top 57.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.
Affected products (as reported)
Weakness: CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H