CVE-2025-34409
📋 TL;DR
MailEnable versions before 10.54 contain a reflected cross-site scripting vulnerability in the Failed parameter of AddRecipientsResult.aspx. Attackers can craft malicious links that execute JavaScript in victims' browsers when clicked, potentially stealing cookies or redirecting users. This affects all MailEnable installations using vulnerable versions.
💻 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 actions as authenticated users including email access and configuration changes.
Likely Case
Attackers steal non-HttpOnly session cookies to hijack authenticated sessions, redirect users to malicious sites, or inject phishing forms to capture credentials.
If Mitigated
With proper controls like HttpOnly cookies and Content Security Policy, impact reduces to limited UI manipulation and temporary session hijacking attempts.
🎯 Exploit Status
Exploitation requires user interaction (clicking malicious link). Payload examples available in public advisories.
🛠️ 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 in admin interface.
🔧 Temporary Workarounds
Input Validation Filter
allImplement web application firewall or input validation to sanitize Failed parameter
Content Security Policy
allImplement strict CSP headers to prevent script execution from untrusted sources
🧯 If You Can't Patch
- Implement web application firewall with XSS protection rules
- Educate users about phishing risks and suspicious links
🔍 How to Verify
Check if Vulnerable:
Access /Mondo/lang/sys/Forms/MAI/AddRecipientsResult.aspx?Failed=<script>alert('test')</script> and check if script executesCheck Version:
Check MailEnable Admin interface or registry: HKEY_LOCAL_MACHINE\SOFTWARE\MailEnableVerify Fix Applied:
Test same payload after patch - script should not execute and input should be properly encoded📡 Detection & Monitoring
Log Indicators:
- HTTP GET requests to AddRecipientsResult.aspx with script tags in Failed parameter
- Unusual length or encoded characters in Failed parameter
Network Indicators:
- HTTP requests containing <script> tags in URL parameters
- Multiple failed recipient attempts with unusual parameters
SIEM Query:
source="mailenable.logs" AND uri="*AddRecipientsResult.aspx*" AND (Failed="*<script>*" OR Failed="*javascript:*")