CVE-2025-34404: MailEnable < 10.54 Reflected XSS in InstanceScope Parameter of CAL/compose.aspx
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-34404?
CVE-2025-34404 has a high severity due to its ability to execute reflected cross-site scripting attacks.
How do I fix CVE-2025-34404?
To fix CVE-2025-34404, upgrade MailEnable to version 10.54 or later.
What is the impact of CVE-2025-34404?
The impact of CVE-2025-34404 includes potential unauthorized access to user sessions and data due to XSS exploitation.
Which versions of MailEnable are affected by CVE-2025-34404?
MailEnable versions prior to 10.54 are affected by CVE-2025-34404.
Can CVE-2025-34404 be exploited remotely?
Yes, CVE-2025-34404 can be exploited remotely via crafted GET requests containing malicious InstanceScope parameters.