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Mailessentials CVE-2026-23621

MEDIUM
Observable Discrepancy (CWE-203)
2026-02-19 disclosure@vulncheck.com
RCE Mailessentials
4.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:03 vuln.today
CVE Published
Feb 19, 2026 - 19:22 nvd
MEDIUM 4.3

DescriptionCVE.org

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.

AnalysisAI

GFI MailEssentials AI versions prior to 22.4 allow authenticated users to enumerate arbitrary directories on the server through the ListServer.IsPathExist() web method, which fails to validate filesystem paths before checking their existence. An attacker with valid credentials can exploit this information disclosure vulnerability to map the server's directory structure and identify sensitive locations. …

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Vulnerability AssessmentAI

Risk Assessment CVSS 4.3 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker (requires authentication) could exploit this vulnerability to compromise the affected system.
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CVE-2026-23621 vulnerability details – vuln.today
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