CVE-2025-34402

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 FieldCc parameter of the ''/Mondo/lang/sys/Forms/AddressBook.aspx'' endpoint. The FieldCc 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 could allow redirection to malicious sites, theft of non-HttpOnly cookies, injection of arbitrary HTML or CSS, and actions performed as the authenticated user.

Recommendations Update MailEnable to version 10.54 or later.