CVE-2026-23621— GFI MailEssentials AI < 22.4 ListServer.IsPathExist() Absolute Directory Traversal to File Enumeration
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过差异性导致的信息暴露
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor · 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
- CVE-2026-23620
GFI MailEssentials AI < 22.4 ListServer.IsDbExist() Absolute - CVE-2026-23619
GFI MailEssentials AI < 22.4 General Settings Local Domains - CVE-2026-23618
GFI MailEssentials AI < 22.4 Anti-Spam Spam Keyword Checking - CVE-2026-23617
GFI MailEssentials AI < 22.4 Anti-Spam Spam Keyword Checking - CVE-2026-23616
GFI MailEssentials AI < 22.4 Anti-Spam Anti-Spoofing Descrip
Same vendor: GFI Software
- CVE-2026-23753
GFI HelpDesk < 4.99.9 Stored XSS via charset Parameter - CVE-2026-23752
GFI HelpDesk < 4.99.9 Stored XSS via companyname Parameter - CVE-2026-23756
GFI HelpDesk < 4.99.9 Stored XSS via Troubleshooter Step Sub - CVE-2026-23758
GFI HelpDesk < 4.99.9 Stored XSS via editsubject Parameter - CVE-2026-23757
GFI HelpDesk < 4.99.10 Stored XSS via Reports Module
Same weakness: CWE-203
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Weblate: Private Translation Enumeration via Screenshot API - CVE-2023-5872
Wago: Vulnerability in Smart Designer Web-Application - CVE-2026-33429
Parse Server: Protected field change detection oracle via Li - CVE-2026-33425
Discourse has inferable private group membership or existenc - CVE-2026-3580
Compiler-induced timing leak in sp_256_get_entry_256_9 on RI
V. Comments for CVE-2026-23621
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