CVE-2026-23616: Gfi Mailessentials

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Anti-Spoofing configuration page. An authenticated user can supply HTML/JavaScript in the ctl00$ContentPlaceHolder1$AntiSpoofingGeneral1$TxtSmtpDesc parameter to /MailEssentials/pages/MailSecurity/AntiSpoofing.aspx, which is stored and later rendered in the management interface, allowing script execution in the context of a logged-in user.

Affected products

• Gfi Mailessentials: before 22.4 (fixed in 22.4)

Published 2026-02-19. Last modified 2026-06-17.