What is CVE-2026-23620?

CVE-2026-23620 is a medium-severity vulnerability in Gfi Mailessentials, classified under Observable Discrepancy. CVSS score: 4.3/10. Published 2026-02-19.

How severe is CVE-2026-23620?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Gfi Mailessentials

CVE-2026-23620

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.

EPSS: 0.002 (8.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Gfi Mailessentials
Gfi Software Mailessentials Ai — versions 0

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

disclosure@vulncheck.com (release-notes, Release Notes, patch)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-23620?: CVE-2026-23620 is a medium-severity vulnerability in Gfi Mailessentials, classified under Observable Discrepancy. CVSS score: 4.3/10. Published 2026-02-19.
How severe is CVE-2026-23620?: Medium severity. CVSS v3 base score is 4.3 out of 10.