CVE-2026-27064 PUBLISHED

WordPress Mailster plugin <= 4.1.17 - Arbitrary File Upload vulnerability

Assigner: Patchstack
Reserved: 17.02.2026 Published: 23.07.2026 Updated: 23.07.2026

Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 9.1

Product Status

Vendor EverPress
Product Mailster
Versions Default: unaffected
  • affected from n/a to 4.1.17 (incl.)

Solutions

Update the WordPress Mailster Plugin to the latest available version (at least 4.1.18).

Credits

  • Phat RiO | Patchstack Bug Bounty Program finder

References

Problem Types

  • CWE-434 Unrestricted Upload of File with Dangerous Type CWE

Impacts

  • CAPEC-17 Using Malicious Files