CVE-2026-23621: Gfi Mailessentials

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

GFI MailEssentials AI versions prior to 22.4 contain an arbitrary directory existence enumeration vulnerability in the ListServer.IsPathExist() web method exposed at /MailEssentials/pages/MailSecurity/ListServer.aspx/IsPathExist. An authenticated user can supply an unrestricted filesystem path via the JSON key \"path\", which is URL-decoded and passed to Directory.Exists(), allowing the attacker to determine whether arbitrary directories exist on the server.

Affected products

• Gfi Mailessentials: before 22.4 (fixed in 22.4)

Published 2026-02-19. Last modified 2026-06-17.