Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 7.5%
CVSS Severity
CVSS v3 Score 4.3
References
Products affected by CVE-2026-23621
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cpe:2.3:a:gfi:mailessentials:20
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cpe:2.3:a:gfi:mailessentials:20.1
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cpe:2.3:a:gfi:mailessentials:20.2
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cpe:2.3:a:gfi:mailessentials:20.3
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cpe:2.3:a:gfi:mailessentials:21.0
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cpe:2.3:a:gfi:mailessentials:21.1
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cpe:2.3:a:gfi:mailessentials:21.2
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cpe:2.3:a:gfi:mailessentials:21.3
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cpe:2.3:a:gfi:mailessentials:21.4
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cpe:2.3:a:gfi:mailessentials:21.5
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cpe:2.3:a:gfi:mailessentials:21.6
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cpe:2.3:a:gfi:mailessentials:21.7
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cpe:2.3:a:gfi:mailessentials:21.8