CVE-2026-23604: GFI MailEssentials AI < 22.4 Keyword Filtering Rule Stored XSS
GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Keyword Filtering rule creation workflow. An authenticated user can supply HTML/JavaScript in the ctl00$ContentPlaceHolder1$pv1$TXBRuleName parameter to /MailEssentials/pages/MailSecurity/contentchecking.aspx, which is stored and later rendered in the management interface, allowing script execution in the context of a logged-in user.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-23604?
CVE-2026-23604 is categorized as a stored cross-site scripting vulnerability, which can allow attackers to execute malicious scripts in the context of a user's session.
How do I fix CVE-2026-23604?
To fix CVE-2026-23604, upgrade GFI MailEssentials AI to version 22.4 or later.
Who is affected by CVE-2026-23604?
CVE-2026-23604 affects all versions of GFI MailEssentials AI prior to 22.4.
What type of vulnerability is CVE-2026-23604?
CVE-2026-23604 is a stored cross-site scripting vulnerability found in the Keyword Filtering rule creation workflow.
Can an unauthenticated user exploit CVE-2026-23604?
No, CVE-2026-23604 requires an authenticated user to exploit the vulnerability.