CVE-2025-34408
📋 TL;DR
MailEnable versions before 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the Added parameter of /Mondo/lang/sys/Forms/MAI/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 manipulation.
Likely Case
Attackers steal non-HttpOnly session cookies to hijack authenticated sessions, potentially accessing email accounts and sensitive data.
If Mitigated
With HttpOnly cookies and proper input validation, impact reduces to limited HTML/CSS injection or temporary page defacement.
🎯 Exploit Status
Reflected XSS vulnerabilities are commonly weaponized in phishing campaigns. No public proof-of-concept identified but exploitation is straightforward.
🛠️ 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 the vendor website. 2. Run the installer to upgrade. 3. Restart MailEnable services. 4. Verify the version is 10.54 or higher.
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allImplement WAF rules to block malicious XSS payloads in the Added parameter
Input Validation Filter
windowsAdd input validation to sanitize the Added parameter before processing
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to prevent script execution
- Disable or restrict access to the vulnerable endpoint via firewall rules
🔍 How to Verify
Check if Vulnerable:
Access /Mondo/lang/sys/Forms/MAI/AddRecipientsResult.aspx?Added=test and check if input is reflected unsanitized in responseCheck Version:
Check MailEnable version in administrative interface or program files version informationVerify Fix Applied:
After patching, test with XSS payloads in Added parameter and verify they are properly sanitized or blocked📡 Detection & Monitoring
Log Indicators:
- HTTP GET requests to AddRecipientsResult.aspx with suspicious Added parameter values containing script tags or JavaScript
Network Indicators:
- Unusual traffic patterns to the vulnerable endpoint with encoded payloads
SIEM Query:
source="mailenable.log" AND uri="/Mondo/lang/sys/Forms/MAI/AddRecipientsResult.aspx" AND query="*Added=*<script*"