What is the CVSS score of CVE-2026-23621?

CVE-2026-23621 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Mailessentials are affected by CVE-2026-23621?

CVE-2026-23621 presents moderate security risk rated CVSS 4.3. Exploitation could compromise the security of affected deployments.

How to fix or mitigate CVE-2026-23621?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Mailessentials CVE-2026-23621

MEDIUM

Observable Discrepancy (CWE-203)

2026-02-19 disclosure@vulncheck.com

RCE Mailessentials

4.3

CVSS 3.1 · NVD

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

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. No patch is currently available for this vulnerability.

Technical ContextAI

Affects Mailessentials. 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.