CVE-2025-34402
MailEnable < 10.54 Reflected XSS in FieldCc Parameter of AddressBook.aspx
Description
MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the FieldCc parameter of /Mondo/lang/sys/Forms/AddressBook.aspx. The FieldCc value is not properly sanitized when processed via a GET request and is reflected inside a <script> block in the JavaScript variable var CCFieldProvided. By supplying a crafted payload that terminates the existing LoadCurAddresses() function, inserts attacker-controlled script, and comments out remaining code, a remote attacker can execute arbitrary JavaScript in a victim’s browser when the victim attempts to send an email. Successful exploitation can redirect victims to malicious sites, steal non-HttpOnly cookies, inject arbitrary HTML or CSS, and perform actions as the authenticated user.
INFO
Published Date :
Dec. 9, 2025, 6:15 p.m.
Last Modified :
Oct. 19, 2026, 7:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update MailEnable to version 10.54 or later.
- Sanitize FieldCc parameter input.
- Validate reflected data within script blocks.
- Implement output encoding for user input.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-34402.
| URL | Resource |
|---|---|
| https://mailenable.com/Standard-ReleaseNotes.txt | Release Notes |
| https://www.mailenable.com/ | Product |
| https://www.vulncheck.com/advisories/mailenable-reflected-xss-in-fieldcc-parameter-of-addressbook-aspx | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-34402 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-34402
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-34402 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-34402 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 19, 2026
Action Type Old Value New Value Added Translation Title: MailEnable, Description: Versiones de MailEnable anteriores a la 10.54 contienen una vulnerabilidad de Cross-site Scripting (XSS) reflejado en el parámetro FieldCc de /Mondo/lang/sys/Forms/AddressBook.aspx. El valor de FieldCc no se depura correctamente cuando se procesa a través de una solicitud GET y se refleja dentro de un bloque [script_tag] en la variable JavaScript var CCFieldProvided. Al proporcionar una carga útil manipulada que termina la función LoadCurAddresses() existente, inserta script controlado por el atacante y comenta el código restante, un atacante remoto puede ejecutar JavaScript arbitrario en el navegador de una víctima cuando esta intenta enviar un correo electrónico. La explotación exitosa puede redirigir a las víctimas a sitios maliciosos, robar cookies no HttpOnly, inyectar HTML o CSS arbitrario y realizar acciones como el usuario autenticado. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'MailEnable', 'product': 'MailEnable', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '10.54', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-34402', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2025-12-09T20:12:11.481041Z'} -
Initial Analysis by [email protected]
Dec. 09, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:mailenable:mailenable:*:*:*:*:standard:*:*:* versions up to (excluding) 10.54 Added Reference Type VulnCheck: https://mailenable.com/Standard-ReleaseNotes.txt Types: Release Notes Added Reference Type VulnCheck: https://www.mailenable.com/ Types: Product Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/mailenable-reflected-xss-in-fieldcc-parameter-of-addressbook-aspx Types: Third Party Advisory -
New CVE Received by [email protected]
Dec. 09, 2025
Action Type Old Value New Value Added Description MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the FieldCc parameter of /Mondo/lang/sys/Forms/AddressBook.aspx. The FieldCc value is not properly sanitized when processed via a GET request and is reflected inside a <script> block in the JavaScript variable var CCFieldProvided. By supplying a crafted payload that terminates the existing LoadCurAddresses() function, inserts attacker-controlled script, and comments out remaining code, a remote attacker can execute arbitrary JavaScript in a victim’s browser when the victim attempts to send an email. Successful exploitation can redirect victims to malicious sites, steal non-HttpOnly cookies, inject arbitrary HTML or CSS, and perform actions as the authenticated user. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-79 Added Reference https://mailenable.com/Standard-ReleaseNotes.txt Added Reference https://www.mailenable.com/ Added Reference https://www.vulncheck.com/advisories/mailenable-reflected-xss-in-fieldcc-parameter-of-addressbook-aspx