CVE-2025-34399

MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the AddressesCc parameter of /Mondo/lang/sys/Forms/AddressBook.aspx. The AddressesCc value is not properly sanitized when processed via a GET request and is reflected within a <script> block in the JavaScript variable var sAddrCc. 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 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.

• CWE-79

• https://mailenable.com/Standard-ReleaseNotes.txtRelease Notes
• https://www.mailenable.com/Product
• https://www.vulncheck.com/advisories/mailenable-reflected-xss-in-addressescc-parameter-of-addressbook-aspxThird Party Advisory

Published

Dec 9, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

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