Is CVE-2026-23620 in the CISA KEV catalog?

No. CVE-2026-23620 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-23620?

CVE-2026-23620 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2026-23620?

CVE-2026-23620 has an EPSS score of 0.18% (8th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-23620?

Upgrade mailessentials to 22.4 or later.

CVE & CISA-KEV Catalog

CVE-2026-23620

MEDIUM

4.3

CVSS v3

NVD

Description

GFI MailEssentials AI versions prior to 22.4 contain an arbitrary file existence enumeration vulnerability in the ListServer.IsDBExist() web method exposed at /MailEssentials/pages/MailSecurity/ListServer.aspx/IsDBExist. An authenticated user can supply an unrestricted filesystem path via the JSON key \"path\", which is URL-decoded and passed to File.Exists(), allowing the attacker to determine whether arbitrary files exist on the server.

CWE-203

How to fix

Remediation Available

mailessentialsNVD

Affected:< 22.4Fixed in:22.4CVE-2026-23620derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

0.18%probability of exploitation in 30 days

8thpercentile

Low risk: more likely to be exploited than 8% of all known CVEs.

References

Third-Party Advisory1

vulncheck.com

Release Notes1

gfi.ai

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-20.