CVE-2025-64675: Microsoft Azure Cosmos DB XSS Vulnerability

CVE-2025-64675 Overview

A cross-site scripting (XSS) vulnerability has been identified in Microsoft Azure Cosmos DB that allows an unauthorized attacker to perform spoofing attacks over a network. This vulnerability stems from improper neutralization of input during web page generation (CWE-79), enabling attackers to inject malicious scripts that execute in the context of authenticated user sessions.

Critical Impact

This XSS vulnerability in Azure Cosmos DB could allow attackers to hijack user sessions, steal sensitive credentials, manipulate data displayed to users, or conduct phishing attacks targeting cloud database administrators and developers working with Cosmos DB resources.

Affected Products

• Microsoft Azure Cosmos DB

Discovery Timeline

• 2025-12-19 - CVE-2025-64675 published to NVD
• 2026-01-16 - Last updated in NVD database

Technical Details for CVE-2025-64675

Vulnerability Analysis

This cross-site scripting vulnerability in Azure Cosmos DB arises from insufficient input sanitization when rendering user-controlled data within the web interface. The vulnerability requires user interaction to trigger, meaning an attacker must craft a malicious link or payload that a victim must visit or interact with. Once triggered, the attack can cross security boundaries (scope change), potentially affecting resources beyond the vulnerable component itself.

The impact profile demonstrates high severity for both confidentiality and integrity, as successful exploitation could allow an attacker to access sensitive data stored in Cosmos DB, modify displayed information, or perform actions on behalf of authenticated users. The availability impact is lower but still present, potentially disrupting normal operations.

Root Cause

The root cause of CVE-2025-64675 is improper neutralization of input during web page generation, classified under CWE-79. The Azure Cosmos DB web interface fails to adequately sanitize or encode user-supplied input before incorporating it into dynamically generated web pages. This allows specially crafted input containing JavaScript code to be rendered and executed in victims' browsers.

Attack Vector

The attack is network-based and requires user interaction. An attacker could exploit this vulnerability by:

1. Crafting a malicious URL or payload containing JavaScript code
2. Delivering the malicious link to victims via email, messaging platforms, or embedding it in compromised websites
3. When the victim clicks the link or interacts with the payload while authenticated to Azure Cosmos DB, the malicious script executes in their browser context
4. The script can then access session tokens, perform actions on behalf of the user, exfiltrate sensitive data, or redirect users to phishing pages

The scope change characteristic means that the malicious script executing in the victim's browser can potentially access resources beyond the immediate Azure Cosmos DB context, depending on the browser's security model and same-origin policies.

Detection Methods for CVE-2025-64675

Indicators of Compromise

• Unusual or unexpected JavaScript execution in Azure Cosmos DB web interface logs
• Browser console errors indicating script injection attempts or cross-origin violations
• Reports of users being redirected to unexpected URLs after interacting with Cosmos DB
• Authentication tokens or session cookies appearing in unexpected network requests

Detection Strategies

• Monitor web application firewall (WAF) logs for XSS attack patterns targeting Azure Cosmos DB endpoints
• Implement Content Security Policy (CSP) headers and monitor for violations that may indicate injection attempts
• Review Azure Activity Logs and Azure Monitor for anomalous access patterns or suspicious API calls
• Deploy browser-based XSS detection extensions for users accessing administrative interfaces

Monitoring Recommendations

• Enable verbose logging for Azure Cosmos DB web interface access and review for suspicious request parameters
• Configure Azure Security Center alerts for web application vulnerabilities and anomalous user behavior
• Implement real-time monitoring of outbound connections from authenticated browser sessions
• Set up alerts for unusual data access patterns that may indicate session hijacking

How to Mitigate CVE-2025-64675

Immediate Actions Required

• Review the Microsoft Security Advisory for CVE-2025-64675 and apply any available patches or mitigations
• Educate users about the risks of clicking untrusted links while authenticated to Azure services
• Implement or strengthen Content Security Policy headers to prevent inline script execution
• Consider temporarily restricting access to Azure Cosmos DB web interfaces to trusted networks until patches are applied

Patch Information

Microsoft has acknowledged this vulnerability and published guidance through their Security Response Center. Organizations should consult the official Microsoft advisory for specific patch availability and deployment instructions. As Azure Cosmos DB is a managed cloud service, many security updates may be applied automatically by Microsoft.

Workarounds

• Implement strict Content Security Policy (CSP) headers that block inline scripts and restrict script sources to trusted domains
• Use browser extensions or enterprise policies that block known XSS attack vectors
• Access Azure Cosmos DB management interfaces only from dedicated, hardened workstations
• Enable multi-factor authentication to reduce the impact of potential session hijacking
• Consider using Azure Private Link to access Cosmos DB resources without exposure to public internet vectors