PT-2025-50142 · Mailenable · Mailenable

Mushroomsecteam · Published 2025-12-09 · Updated 2025-12-10 · CVE-2025-34403

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 FieldTo parameter of the ''/Mondo/lang/sys/Forms/AddressBook.aspx'' endpoint. The FieldTo value is not properly sanitized when processed via a GET request and is reflected inside a . A remote attacker can execute arbitrary JavaScript in a victim’s browser by supplying a crafted payload that terminates the existing Finish() function, 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-2025-34403

Affected Products

Mailenable

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2025-34403 · Security Note
• https://mailenable.com/Standard-ReleaseNotes.txt · Patch
• https://osv.dev/vulnerability/CVE-2025-34403 · Vendor Advisory
• https://twitter.com/CVEnew/status/1998781320952942873 · Twitter Post
• https://vulncheck.com/advisories/mailenable-reflected-xss-in-fieldto-parameter-of-addressbook-aspx · Note
• https://mailenable.com · Note