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CVE-2026-23621— GFI MailEssentials AI < 22.4 ListServer.IsPathExist() Absolute Directory Traversal to File Enumeration

Quick assessment

Affected
GFI Software MailEssentials AI
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GFI MailEssentials AI是美国GFI开源的一个反垃圾邮件与数据泄露防护软件。 GFI MailEssentials AI 22.4之前版本存在安全漏洞，该漏洞源于ListServer.IsPathExist() Web方法存在任意目录存在枚举漏洞，可能导致信息泄露。

CVSS 4.3 · Medium EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
GFI Software MailEssentials AI < 22.4 affected
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I. Basic Information for CVE-2026-23621

Vulnerability Information
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Vulnerability Title
GFI MailEssentials AI < 22.4 ListServer.IsPathExist() Absolute Directory Traversal to File Enumeration
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
GFI MailEssentials AI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GFI MailEssentials AI是美国GFI开源的一个反垃圾邮件与数据泄露防护软件。 GFI MailEssentials AI 22.4之前版本存在安全漏洞，该漏洞源于ListServer.IsPathExist() Web方法存在任意目录存在枚举漏洞，可能导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GFI Software MailEssentials AI 0 ~ 22.4 -

II. Public POCs for CVE-2026-23621

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III. Intelligence Information for CVE-2026-23621

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Vendor Pages for CVE-2026-23621 (1)

Same Patch Batch · GFI Software · 2026-02-19 · 18 CVEs total

CVE-2026-23611 5.4 MEDIUM GFI MailEssentials AI < 22.4 Anti-Spam IP Blocklist Description Stored XSS
CVE-2026-23616 5.4 MEDIUM GFI MailEssentials AI < 22.4 Anti-Spam Anti-Spoofing Description Stored XSS
CVE-2026-23606 5.4 MEDIUM GFI MailEssentials AI < 22.4 Advanced Content Filtering Rule Stored XSS
CVE-2026-23608 5.4 MEDIUM GFI MailEssentials AI < 22.4 Email Management Mail Monitoring Rule Stored XSS
CVE-2026-23605 5.4 MEDIUM GFI MailEssentials AI < 22.4 Attachment Filtering Rule Stored XSS
CVE-2026-23607 5.4 MEDIUM GFI MailEssentials AI < 22.4 Anti-Spam Whitelist Description Stored XSS
CVE-2026-23613 5.4 MEDIUM GFI MailEssentials AI < 22.4 Anti-Spam URI DNS Blocklist Domain Stored XSS
CVE-2026-23609 5.4 MEDIUM GFI MailEssentials AI < 22.4 General Settings Perimeter SMTP Servers Description Stored XS
CVE-2026-23614 5.4 MEDIUM GFI MailEssentials AI < 22.4 Anti-Spam Sender Policy Framework IP Exceptions Description S
CVE-2026-23604 5.4 MEDIUM GFI MailEssentials AI < 22.4 Keyword Filtering Rule Stored XSS
CVE-2026-23612 5.4 MEDIUM GFI MailEssentials AI < 22.4 Anti-Spam IP DNS Blocklist Domain Stored XSS
CVE-2026-23619 5.4 MEDIUM GFI MailEssentials AI < 22.4 General Settings Local Domains Domain Description Stored XSS
CVE-2026-23617 5.4 MEDIUM GFI MailEssentials AI < 22.4 Anti-Spam Spam Keyword Checking Body Condition Stored XSS
CVE-2026-23615 5.4 MEDIUM GFI MailEssentials AI < 22.4 Anti-Spam Sender Policy Framework Email Exceptions Descriptio
CVE-2026-23618 5.4 MEDIUM GFI MailEssentials AI < 22.4 Anti-Spam Spam Keyword Checking Subject Condition Stored XSS
CVE-2026-23610 5.4 MEDIUM GFI MailEssentials AI < 22.4 POP2Exchange POP3 Server Login Stored XSS
CVE-2026-23620 4.3 MEDIUM GFI MailEssentials AI < 22.4 ListServer.IsDBExist() Absolute Directory Traversal to File E

IV. Related Vulnerabilities

Same product: MailEssentials AI
Same vendor: GFI Software
Same weakness: CWE-203

V. Comments for CVE-2026-23621

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