CVE-2025-34404

Description

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.

PUBLISHED Reserved 2025-04-15 | Published 2025-12-09 | Updated 2025-12-12 | Assigner VulnCheck

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Product status

Credits

MushroomSecTeam (Spotify, AmirSUN, M30Brad, Hannah Green, av01t3x, PG) finder

References

mailenable.com/Standard-ReleaseNotes.txt release-notes patch

www.mailenable.com/ product

www.vulncheck.com/...ancescope-parameter-of-cal-compose-aspx third-party-advisory

cve.org (CVE-2025-34404)

nvd.nist.gov (CVE-2025-34404)

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