PT-2026-20889 · Gfi · Gfi Mailessentials

Alex Williams + 1 · Published 2026-02-19 · Updated 2026-02-23 · CVE-2026-23609

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions GFI MailEssentials AI versions prior to 22.4

Description GFI MailEssentials AI contains a stored cross-site scripting issue in the Perimeter SMTP Servers configuration page. A logged-in user can inject HTML or JavaScript code into the ctl00$ContentPlaceHolder1$pv3$txtDescription parameter of the '/MailEssentials/pages/MailSecurity/PerimeterSMTPServers.aspx' API endpoint. This injected code is then saved and displayed within the management interface, leading to script execution within the user's session.

Recommendations Update GFI MailEssentials AI to version 22.4 or later.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-23609

Affected Products

Gfi Mailessentials

References · 7

• https://osv.dev/vulnerability/CVE-2026-23609 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23609 · Security Note
• https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases · Patch
• https://twitter.com/CVEnew/status/2025892035727630839 · Twitter Post
• https://t.me/CVEtracker/45151 · Telegram Post
• https://vulncheck.com/advisories/gfi-mailessentials-ai-general-settings-perimeter-smtp-servers-description-stored-xss · Note
• https://twitter.com/VulmonFeeds/status/2024643004997206049 · Twitter Post