CVE-2025-34403: MailEnable < 10.54 Reflected XSS in FieldTo Parameter of AddressBook.aspx
MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the FieldTo parameter of /Mondo/lang/sys/Forms/AddressBook.aspx. The FieldTo value is not properly sanitized when processed via a GET request and is reflected inside a <script> block in the JavaScript variable var fieldTo. By supplying a crafted payload that terminates the existing Finish() function, inserts attacker-controlled script, and comments out remaining code, a remote attacker can execute arbitrary JavaScript in a victim’s browser when the victim attempts to send an email. 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-2025-34403?
CVE-2025-34403 is classified as a reflected cross-site scripting (XSS) vulnerability which can lead to significant security risks, potentially allowing unauthorized access or data manipulation.
How do I fix CVE-2025-34403?
To mitigate CVE-2025-34403, upgrade MailEnable to version 10.54 or later where the vulnerability has been addressed.
What systems are affected by CVE-2025-34403?
CVE-2025-34403 affects MailEnable versions prior to 10.54.
What is reflected cross-site scripting as related to CVE-2025-34403?
Reflected cross-site scripting in CVE-2025-34403 occurs when unsanitized user input in the FieldTo parameter is reflected in the response, allowing attackers to inject malicious scripts.
Can CVE-2025-34403 lead to data theft?
Yes, CVE-2025-34403 can potentially lead to data theft as attackers may exploit the XSS vulnerability to execute scripts that steal sensitive information from users.