# CVE-2025-34401: MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the FieldBcc…

Source: https://junglewise.ai/threats/cve-2025-34401-mailenable-versions-prior-to-10-54-contain-a-reflected-cross-site  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-12-09  
License: CC BY 4.0 with a link back

CVE-2025-34401 · Severity: medium · CVSS 6.1 · Published 2025-12-09

MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the FieldBcc parameter of /Mondo/lang/sys/Forms/AddressBook.aspx. The FieldBcc value is not properly sanitized when processed via a GET request and is reflected inside a <script> block in the JavaScript variable var BCCFieldProvided. 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 during normal email composition. Successful exploitation can redirect victims to malicious sites, steal non-HttpOnly cookies, inject arbitrary HTML or CSS, and perform actions as the authenticated user.

Technologies: [Mailenable](https://junglewise.ai/threats/technologies/mailenable). Vendors: [MailEnable](https://junglewise.ai/threats/vendors/mailenable).

## Quick answers

**Is CVE-2025-34401 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-34401 being exploited in the wild.

**How severe is CVE-2025-34401?** Medium severity, with a CVSS score of 6.1, published 9 December 2025.

**Which products and versions are affected?** Mailenable. The advisory does not name versions.

**Is there a fix for CVE-2025-34401?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2025-34401?** Check whether you run Mailenable. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Mailenable

## Related threats

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- [MailEnable Enterprise Premium auth bypass in WebAdmin mobile portal](https://junglewise.ai/threats/cve-2026-44400-mailenable-enterprise-premium-auth-bypass-in-webadmin-mobile)
- [MailEnable versions prior to 10.54 contain a cleartext storage of credentials vulnerability that can lead to local…](https://junglewise.ai/threats/cve-2025-34428-mailenable-versions-prior-to-10-54-contain-a-cleartext-storage-of)
- [MailEnable versions prior to 10.54 contain a cleartext storage of credentials vulnerability that can lead to local…](https://junglewise.ai/threats/cve-2025-34427-mailenable-versions-prior-to-10-54-contain-a-cleartext-storage-of)