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Vulnerability record · CVE-2026-23618 · published 19 February 2026

CVE-2026-23618: Gfi mailessentials cross-site scripting vulnerability

Gfi · Mailessentials

GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Spam Keyword Checking (Subject) conditions interface. An authenticated user can supply HTML/JavaScript in the ctl00$ContentPlaceHolder1$pvSubject$TXB_SubjectCondition parameter to /MailEssentials/pages/MailSecurity/ASKeywordChecking.aspx, which is stored and later rendered in the management interface, allowing script execution in the context of a logged-in user.

5.1 CVSS 4.0 Medium EPSS 0.18% · top 93.2% CWE-79 · Cross-site scripting
5.1CVSS 4.0 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Spam Keyword Checking (Subject) conditions interface. An authenticated user can supply HTML/JavaScript in the ctl00$ContentPlaceHolder1$pvSubject$TXB_SubjectCondition parameter to /MailEssentials/pages/MailSecurity/ASKeywordChecking.aspx, which is stored and later rendered in the management interface, allowing script execution in the context of a logged-in user.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases Release Notes
https://www.vulncheck.com/advisories/gfi-mailessentials-ai-anti-spam-spam-keyword-checking-subject-condition-stored-xss Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2004-1312Gfi mailessentials vulnerabilityA bug in the HTML parser in a certain Microsoft HTML library, as used in various third party products, may allow remote attackers to cause a denial o…EPSS 2.5%8.8CVE-2025-34491Gfi mailessentials deserialization of untrusted data vulnerabilityGFI MailEssentials prior to version 21.8 is vulnerable to a .NET deserialization issue. A remote and authenticated attacker can execute arbitrary cod…EPSS 0.95%7.8CVE-2025-34489Gfi mailessentials deserialization of untrusted data vulnerabilityGFI MailEssentials prior to version 21.8 is vulnerable to a local privilege escalation issue. A local attacker can escalate to NT Authority/SYSTEM by…EPSS 0.33%6.5CVE-2025-34490Gfi mailessentials xml external entity (xxe) vulnerabilityGFI MailEssentials prior to version 21.8 is vulnerable to an XML External Entity (XXE) issue. An authenticated and remote attacker can send crafted H…EPSS 0.72%5.3CVE-2026-23621Gfi mailessentials observable discrepancy vulnerabilityGFI MailEssentials AI versions prior to 22.4 contain an arbitrary directory existence enumeration vulnerability in the ListServer.IsPathExist() web m…EPSS 0.25%5.3CVE-2026-23620Gfi mailessentials observable discrepancy vulnerabilityGFI MailEssentials AI versions prior to 22.4 contain an arbitrary file existence enumeration vulnerability in the ListServer.IsDBExist() web method e…EPSS 0.19%5.1CVE-2026-23616Gfi mailessentials cross-site scripting vulnerabilityGFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Anti-Spoofing configuration page. An authenti…EPSS 0.18%5.1CVE-2026-23617Gfi mailessentials cross-site scripting vulnerabilityGFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Spam Keyword Checking (Body) conditions inter…EPSS 0.18%

Source: NIST National Vulnerability Database (record CVE-2026-23618), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.