CVE-2025-34404

MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the InstanceScope parameter of /Mondo/lang/sys/Forms/CAL/compose.aspx. The InstanceScope value is not properly sanitized when processed via a GET request and is reflected inside a <script> block in the JavaScript variable var gInstanceScope. By supplying a crafted payload that terminates the existing PageLoad() function, inserts attacker-controlled script, and comments out remaining code, a remote attacker can execute arbitrary JavaScript in a victim’s browser. Successful exploitation can redirect victims to malicious sites, steal non-HttpOnly cookies, inject arbitrary HTML or CSS, and perform actions as the authenticated user.

The following products are affected by CVE-2025-34404 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-34404.

URL	Resource
https://mailenable.com/Standard-ReleaseNotes.txt
https://www.mailenable.com/
https://www.vulncheck.com/advisories/mailenable-reflected-xss-in-instancescope-parameter-of-cal-compose-aspx