CVE-2025-63499
📋 TL;DR
Alinto SOGo 5.12.3 contains a cross-site scripting vulnerability in the theme parameter that allows attackers to inject malicious scripts. When exploited, this can lead to session hijacking, credential theft, or redirection to malicious sites. Organizations using SOGo 5.12.3 for webmail or groupware services are affected.
💻 Affected Systems
- Alinto SOGo
📦 What is this software?
Sogo by Alinto
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator credentials, gain full control of the SOGo instance, and compromise all user accounts and data.
Likely Case
Attackers steal user session cookies to impersonate legitimate users, access sensitive emails, and potentially pivot to other systems.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy headers in place.
🎯 Exploit Status
Simple reflected XSS requiring user to click malicious link; proof-of-concept available in GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Monitor vendor for patch release
2. Apply patch when available
3. Verify fix by testing theme parameter injection
🔧 Temporary Workarounds
Input Validation Filter
allAdd server-side validation to reject or sanitize theme parameter containing script tags
# Configure web server (Apache/Nginx) to filter malicious theme parameters
# Implement input validation in SOGo configuration
Content Security Policy
allImplement CSP headers to prevent script execution from untrusted sources
# Add to web server config: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
# Restart web service after configuration
🧯 If You Can't Patch
- Implement web application firewall rules to block theme parameter containing script tags
- Educate users about phishing risks and not clicking untrusted SOGo links
🔍 How to Verify
Check if Vulnerable:
Test by accessing SOGo with theme parameter containing script payload: /SOGo/so/user@domain.com/Mail/view?theme=<script>alert('test')</script>Check Version:
sogo-tool version | grep 'SOGo'Verify Fix Applied:
Retest with same payload after applying workarounds; script should not execute📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing 'theme=' parameter with script tags
- Unusual theme parameter values in access logs
Network Indicators:
- HTTP GET requests with encoded script payloads in theme parameter
SIEM Query:
source="web_access_logs" AND uri="*theme=*<script>*" OR uri="*theme=*%3Cscript%3E*"