CVE-2026-23621

MEDIUM 4.3CVE-2026-23621 · Published 19/02/2026 · updated 17/06/2026

In short

CVE-2026-23621 is a MEDIUM (CVSS 4.3) vulnerability affecting mailessentials (gfi).
Chance of exploitation in the next 30 days (EPSS): 0.28%, higher than 20.9% of all vulnerabilities.
Fix: update to 22.4 or later.

Package	Affected versions	Patched versions
mailessentials gfi	`< 22.4`	`22.4`

Description

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.

References

gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases · Release Notes
vulncheck.com/advisories/gfi-mailessentials-ai-listserver-ispathexist-absolute-directory-traversal-to-file-enumeration · Third Party Advisory

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Package

Affected versions

Patched versions

mailessentials

gfi

< 22.4

22.4

Description

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