PT-2025-50139 · Mailenable · Mailenable

Mushroomsecteam · CVE-2025-34400 · Published 2025-12-09 · Updated 2025-12-10

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions MailEnable versions prior to 10.54

Description MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) issue in the AddressesTo parameter of the ''/Mondo/lang/sys/Forms/AddressBook.aspx'' endpoint. The AddressesTo value is not properly sanitized when processed via a GET request and is reflected within a <script> block in the response. A remote attacker can execute arbitrary JavaScript in a victim’s browser when the victim attempts to send an email by supplying a crafted payload that terminates existing JavaScript, inserts attacker-controlled script, and comments out remaining code. Successful exploitation can redirect victims to malicious sites, steal non-HttpOnly cookies, inject arbitrary HTML or CSS, and perform actions as the authenticated user.

Recommendations Update MailEnable to version 10.54 or later.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2025-34400

Affected Products

Mailenable

References · 6

• https://mailenable.com/Standard-ReleaseNotes.txt · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-34400 · Security Note
• https://osv.dev/vulnerability/CVE-2025-34400 · Vendor Advisory
• https://vulncheck.com/advisories/mailenable-reflected-xss-in-addressesto-parameter-of-addressbook-aspx · Note
• https://mailenable.com · Note
• https://twitter.com/CVEnew/status/1998781317069013140 · Twitter Post