PT-2025-50140 · Mailenable · Mailenable

Mushroomsecteam · CVE-2025-34401 · 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 The software contains a reflected cross-site scripting (XSS) issue in the FieldBcc parameter of the ''/Mondo/lang/sys/Forms/AddressBook.aspx'' endpoint. The FieldBcc value is not properly sanitized when processed via a GET request and is reflected inside a . An attacker can execute arbitrary JavaScript in a victim’s browser during normal email composition by supplying a crafted payload that terminates the existing LoadCurAddresses() function, inserts attacker-controlled script, and comments out remaining code. Successful exploitation could redirect victims to malicious sites, steal non-HttpOnly cookies, inject arbitrary HTML or CSS, and perform actions as the authenticated user.

Recommendations Update to version 10.54 or later.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2025-34401

Affected Products

Mailenable

References · 6

• https://osv.dev/vulnerability/CVE-2025-34401 · Vendor Advisory
• https://mailenable.com/Standard-ReleaseNotes.txt · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-34401 · Security Note
• https://vulncheck.com/advisories/mailenable-reflected-xss-in-fieldbcc-parameter-of-addressbook-aspx · Note
• https://twitter.com/CVEnew/status/1998781318973337670 · Twitter Post
• https://mailenable.com · Note