CVE-2025-34401
📋 TL;DR
MailEnable versions before 10.54 contain a reflected XSS vulnerability in the AddressBook.aspx FieldBcc parameter. Attackers can craft malicious URLs that execute JavaScript in victims' browsers when clicked, potentially stealing session cookies or performing actions as the authenticated user. This affects all MailEnable users with vulnerable versions exposed to untrusted networks.
💻 Affected Systems
- MailEnable
📦 What is this software?
Mailenable by Mailenable
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal authenticated session cookies, hijack user accounts, redirect to phishing sites, and perform unauthorized email operations as the victim.
Likely Case
Attackers steal non-HttpOnly session cookies to hijack authenticated sessions, potentially accessing email accounts and sensitive communications.
If Mitigated
With proper input validation and output encoding, the attack fails to execute malicious scripts, limiting impact to parameter reflection without code execution.
🎯 Exploit Status
Exploitation requires victim interaction (clicking malicious link) but uses standard XSS techniques with no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.54
Vendor Advisory: https://mailenable.com/Standard-ReleaseNotes.txt
Restart Required: Yes
Instructions:
1. Download MailEnable version 10.54 or later from vendor website. 2. Backup current installation. 3. Run installer to upgrade. 4. Restart MailEnable services. 5. Verify version shows 10.54 or higher.
🔧 Temporary Workarounds
Input Validation Filter
allImplement web application firewall or input validation to sanitize FieldBcc parameter values containing script tags or JavaScript syntax.
Access Restriction
allRestrict access to /Mondo/lang/sys/Forms/AddressBook.aspx to trusted IP addresses only.
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to block inline script execution.
- Deploy web application firewall with XSS protection rules to filter malicious payloads.
🔍 How to Verify
Check if Vulnerable:
Test by accessing https://[mailserver]/Mondo/lang/sys/Forms/AddressBook.aspx?FieldBcc=test%22%3E%3Cscript%3Ealert(1)%3C/script%3E and checking if script executes.Check Version:
Check MailEnable Admin Console or registry key: HKEY_LOCAL_MACHINE\SOFTWARE\MailEnable\Mail Enable\VersionVerify Fix Applied:
After patching, repeat the test payload; script should not execute and input should be properly encoded.📡 Detection & Monitoring
Log Indicators:
- HTTP GET requests to AddressBook.aspx with FieldBcc parameter containing script tags, JavaScript functions, or encoded payloads.
Network Indicators:
- Unusual outbound connections from mail server to external domains following access to AddressBook.aspx.
SIEM Query:
source="web_logs" AND uri_path="/Mondo/lang/sys/Forms/AddressBook.aspx" AND query_string="*FieldBcc=*script*"