CVE-2025-64675
📋 TL;DR
This cross-site scripting (XSS) vulnerability in Azure Cosmos DB allows attackers to inject malicious scripts into web pages generated by the database service. When exploited, it enables spoofing attacks where users can be tricked into performing unintended actions. All Azure Cosmos DB deployments using affected configurations are potentially vulnerable.
💻 Affected Systems
- Azure Cosmos DB
📦 What is this software?
Azure Cosmos Db by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, data exfiltration, and lateral movement within the Azure environment through session hijacking and credential theft.
Likely Case
Session hijacking, data manipulation, and phishing attacks against users accessing Cosmos DB web interfaces.
If Mitigated
Limited impact with proper input validation and output encoding in place, potentially only affecting specific UI components.
🎯 Exploit Status
XSS vulnerabilities typically have low exploitation complexity once the injection point is identified
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific version
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64675
Restart Required: No
Instructions:
1. Log into Azure Portal
2. Navigate to your Cosmos DB instance
3. Check for available updates in the configuration section
4. Apply Microsoft-provided security updates
5. Verify the update completes successfully
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation and output encoding for all user-controlled data in Cosmos DB applications
Content Security Policy
allImplement strict CSP headers to mitigate XSS impact
🧯 If You Can't Patch
- Implement WAF rules to block XSS payloads at the network perimeter
- Restrict access to Cosmos DB interfaces to trusted IP ranges only
🔍 How to Verify
Check if Vulnerable:
Test for XSS vulnerabilities in Cosmos DB web interfaces using security testing tools or manual testing with payloads like <script>alert('test')</script>Check Version:
Check Azure Portal for Cosmos DB instance version and compare with patched versions in Microsoft advisoryVerify Fix Applied:
Verify the fix by testing previously vulnerable endpoints with XSS payloads and confirming they are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual HTML/script patterns in query parameters
- Multiple failed XSS attempts in application logs
- Unexpected script execution in browser console logs
Network Indicators:
- HTTP requests containing common XSS payload patterns
- Unusual spikes in requests to Cosmos DB endpoints
SIEM Query:
source="azure-cosmosdb" AND (http_request CONTAINS "<script>" OR http_request CONTAINS "javascript:" OR http_request CONTAINS "onerror=" OR http_request CONTAINS "onload=")