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5.1
GFI MailEssentials AI: Unauthenticated Code Injection in Whitelist Interface
CVE-2026-23607
Summary
A security flaw in older versions of GFI MailEssentials AI allows a malicious user to inject code into the admin interface, potentially allowing them to take control of the system. This issue affects versions of the software prior to 22.4 and can be exploited by a logged-in user. To protect against this issue, update to version 22.4 or later.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| gfi | mailessentials | <= 22.4 | – |
Original title
GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Anti-Spam Whitelist management interface. An authenticated user can supply HTML/JavaScript in...
Original description
GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Anti-Spam Whitelist management interface. An authenticated user can supply HTML/JavaScript in the ctl00$ContentPlaceHolder1$pv1$txtDescription parameter to /MailEssentials/pages/MailSecurity/Whitelist.aspx, which is stored and later rendered in the management interface, allowing script execution in the context of a logged-in user.
nvd CVSS3.1
5.4
nvd CVSS4.0
5.1
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
Published: 19 Feb 2026 · Updated: 11 Mar 2026 · First seen: 6 Mar 2026