PT-2026-20891 · Gfi · Gfi Mailessentials

Alex Williams + 1 · Published 2026-02-19 · Updated 2026-02-23 · CVE-2026-23611

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 The software contains a stored cross-site scripting issue in the IP Blocklist management page. A logged-in user can inject HTML or JavaScript code into the ctl00$ContentPlaceHolder1$pv1$txtIPDescription parameter of the '/MailEssentials/pages/MailSecurity/ipblocklist.aspx' API endpoint. This injected code is then stored and displayed within the management interface, leading to script execution within the user's session.

Recommendations Update to version 22.4 or later.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-23611

Affected Products

Gfi Mailessentials

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-23611 · Security Note
• https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases · Patch
• https://osv.dev/vulnerability/CVE-2026-23611 · Vendor Advisory
• https://twitter.com/VulmonFeeds/status/2024637885316546800 · Twitter Post
• https://t.me/CVEtracker/45153 · Telegram Post
• https://twitter.com/CVEnew/status/2025809116405579786 · Twitter Post
• https://vulncheck.com/advisories/gfi-mailessentials-ai-anti-spam-ip-blocklist-description-stored-xss · Note