PT-2026-20884 · Gfi · Gfi Mailessentials

Alex Williams + 1 · Published 2026-02-19 · Updated 2026-02-23 · CVE-2026-23604

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 versions prior to 22.4 are affected by a stored cross-site scripting issue within the Keyword Filtering rule creation process. A user with valid credentials can inject HTML or JavaScript code into the ctl00$ContentPlaceHolder1$pv1$TXB RuleName parameter of the '/MailEssentials/pages/MailSecurity/contentchecking.aspx' API endpoint. This injected code is then saved and displayed within the management interface, enabling script execution in the context of the logged-in user.

Recommendations Update GFI MailEssentials AI to version 22.4 or later.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-23604

Affected Products

Gfi Mailessentials

References · 8

• https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-23604 · Security Note
• https://osv.dev/vulnerability/CVE-2026-23604 · Vendor Advisory
• https://vulncheck.com/advisories/gfi-mailessentials-ai-keyword-filtering-rule-stored-xss · Note
• https://twitter.com/CVEnew/status/2025892041150828929 · Twitter Post
• https://t.me/CVEtracker/45146 · Telegram Post
• https://t.me/cveNotify/152620 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2024653244752916673 · Twitter Post