GFI MailEssentials AI up to 22.3 IsPathExist ListServer.IsPathExist information exposure

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in GFI MailEssentials AI up to 22.3. This affects the function ListServer.IsPathExist of the file /MailEssentials/pages/MailSecurity/ListServer.aspx/IsPathExist. Such manipulation leads to information exposure. This vulnerability is traded as CVE-2026-23621. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in GFI MailEssentials AI up to 22.3 and classified as problematic. Affected by this issue is the function ListServer.IsPathExist of the file /MailEssentials/pages/MailSecurity/ListServer.aspx/IsPathExist. The manipulation with an unknown input leads to a information exposure vulnerability. Using CWE to declare the problem leads to CWE-203. The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not. Impacted is confidentiality. CVE summarizes:

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.

The weakness was shared by Alex Williams. The advisory is shared for download at gfi.ai. This vulnerability is handled as CVE-2026-23621 since 01/14/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 22.4 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.3
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Information exposure
CWE: CWE-203 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: MailEssentials AI 22.4

Timelineinfo

01/14/2026 CVE reserved
02/19/2026 +36 days Advisory disclosed
02/19/2026 +0 days VulDB entry created
02/19/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: gfi.ai
Researcher: Alex Williams
Status: Confirmed

CVE: CVE-2026-23621 (🔒)
GCVE (CVE): GCVE-0-2026-23621
GCVE (VulDB): GCVE-100-346964

Entryinfo

Created: 02/19/2026 21:46
Changes: 02/19/2026 21:46 (79)
Complete: 🔍
Cache ID: 216::103

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