5.3

CVE-2026-23621: gfi software mailessentials ai Observable Discrepancy

CVSS: 5.3v4.0MediumAnalyzed
Published 19-02-2026Last modified 14-05-2026
Open JSON

Vulnerability summary

CVE-2026-23621 is a medium (CVSS 5.3) Observable Discrepancy vulnerability in gfi software mailessentials ai. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 19.5% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.28%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 19-02-2026
    PublishedVulnerability first disclosed.
  2. 14-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

+0.03 pp

From 0.25% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.28%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Gfi1 product
Gfi software1 product

2 vendors · 2 products

References

2 links