CVE-2025-34401: MailEnable < 10.54 Reflected XSS in FieldBcc Parameter of AddressBook.aspx
MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the FieldBcc parameter of /Mondo/lang/sys/Forms/AddressBook.aspx. The FieldBcc value is not properly sanitized when processed via a GET request and is reflected inside a <script> block in the JavaScript variable var BCCFieldProvided. By supplying a crafted payload that terminates the existing LoadCurAddresses() function, inserts attacker-controlled script, and comments out remaining code, a remote attacker can execute arbitrary JavaScript in a victim’s browser during normal email composition. Successful exploitation can redirect victims to malicious sites, steal non-HttpOnly cookies, inject arbitrary HTML or CSS, and perform actions as the authenticated user.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-34401?
CVE-2025-34401 has been rated with a medium severity level due to its potential for exploitation via reflected XSS.
How do I fix CVE-2025-34401?
To mitigate CVE-2025-34401, upgrade MailEnable to version 10.54 or later.
What is the impact of CVE-2025-34401?
CVE-2025-34401 allows attackers to execute arbitrary JavaScript code in a user's browser by manipulating the FieldBcc parameter.
Which versions of MailEnable are affected by CVE-2025-34401?
MailEnable versions prior to 10.54 are affected by CVE-2025-34401.
How does CVE-2025-34401 exploit the vulnerability?
CVE-2025-34401 exploits the vulnerability by not properly sanitizing the FieldBcc value in GET requests, allowing it to be reflected in a script block.