CVE-2026-23620: Gfi Mailessentials

Medium severity, CVSS 4.3. EPSS: 0.2% chance of exploitation in the next 30 days.

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

Affected products

• Gfi Mailessentials: before 22.4 (fixed in 22.4)

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