{"id":"CVE-2025-34404","details":"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 \u003cscript\u003e 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.","modified":"2026-03-15T22:51:06.292776Z","published":"2025-12-09T18:15:50.970Z","references":[{"type":"WEB","url":"https://www.mailenable.com/"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/mailenable-reflected-xss-in-instancescope-parameter-of-cal-compose-aspx"},{"type":"ADVISORY","url":"https://mailenable.com/Standard-ReleaseNotes.txt"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-34404.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"10.54"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}