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    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:Feb 19, 2026
    Last Modified:Apr 17, 2026
    EPS:Feb 19, 2026
    EPSS Score:0.00035
    CVSS Score:4.3

    Affected Products

    Vendor
    Gfi
    Product
    Mailessentials
    Vendor
    Gfi
    Product
    Mailessentials Ai

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-203 Observable Discrepancy

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-189 Black Box Reverse Engineering

    Related CVEs

    CVE-2026-23620 (CVSS 5.3) — GFI MailEssentials AI versions prior to 22.4 contain an arbitrary file existence enumeration vulnerability in …
    CVE-2026-23619 (CVSS 5.1) — GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Local …
    CVE-2026-23618 (CVSS 5.1) — GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Spam K…
    CVE-2026-23617 (CVSS 5.1) — GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Spam K…
    CVE-2026-23616 (CVSS 5.1) — GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Anti-S…
    CVE-2026-23615 (CVSS 5.1) — GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Sender…
    CVE-2026-23614 (CVSS 5.1) — GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Sender…
    CVE-2026-23613 (CVSS 5.1) — GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the URI DN…
    CVE-2026-23612 (CVSS 5.1) — GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the IP DNS…
    CVE-2026-23611 (CVSS 5.1) — GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the IP Blo…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High