CVE-2025-34398

Name of the Vulnerable Software and Affected Versions MailEnable versions prior to 10.54

Description MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) issue in the AddressesBcc parameter of the ''/Mondo/lang/sys/Forms/AddressBook.aspx'' endpoint. The AddressesBcc value is not properly sanitized when processed via a GET request and is reflected within a . An attacker can execute arbitrary JavaScript in a victim’s browser by supplying a crafted payload that terminates the LoadCurAddresses() function, inserts attacker-controlled script, and comments out remaining code. Successful exploitation can redirect victims to malicious sites, steal non-HttpOnly cookies, and perform actions as the authenticated user.

Recommendations Update MailEnable to version 10.54 or later.