Vulnerability in Gfi Mailessentials
CVE-2026-23621
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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (20.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Gfi Mailessentials
- Gfi Software Mailessentials Ai — versions 0
Weakness classification (CWE)
References
- gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resourc… (release-notes, Release Notes, patch)
- www.vulncheck.com/advisories/gfi-mailessentials-ai-listserver-ispathexist-absol… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-23621?
- CVE-2026-23621 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-2026-23621?
- Medium severity. CVSS v3 base score is 4.3 out of 10.