Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mailenable | Mailenable | < 10.54 |
Related Weaknesses (CWE)
References
- https://mailenable.com/Standard-ReleaseNotes.txtRelease Notes
- https://www.mailenable.com/Product
- https://www.vulncheck.com/advisories/mailenable-reflected-xss-in-fieldto-parametThird Party Advisory
FAQ
What is CVE-2025-34403?
CVE-2025-34403 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 sa...
How severe is CVE-2025-34403?
CVE-2025-34403 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-34403?
Check the references section above for vendor advisories and patch information. Affected products include: Mailenable Mailenable.