CVE-2025-64675 is a cross-site scripting (XSS) vulnerability classified under CWE-79, affecting Microsoft Azure Cosmos DB, a globally distributed, multi-model database service. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages within the Azure Cosmos DB management or query interfaces. This flaw allows an attacker to inject malicious scripts that execute in the context of a victim's browser, enabling spoofing attacks over the network. The CVSS 3.1 base score of 8.3 reflects a high severity, with an attack vector of network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), but requiring user interaction (UI:R). The scope is unchanged (S:U), and the impacts on confidentiality and integrity are high (C:H/I:H), with a low impact on availability (A:L). The vulnerability could be exploited by tricking an authenticated user into interacting with a crafted malicious link or payload, leading to session hijacking, data theft, or unauthorized commands executed with the victim's privileges. Although no exploits are currently known in the wild, the potential for damage is significant given Azure Cosmos DB's widespread use in cloud applications. The lack of available patches at the time of publication necessitates immediate defensive measures. The vulnerability was reserved on 2025-11-06 and published on 2025-12-18, indicating recent discovery and disclosure. The technical details confirm the vulnerability's presence in the web interface components of Azure Cosmos DB, emphasizing the need for input validation and output encoding to prevent script injection.

For European organizations, the impact of CVE-2025-64675 can be substantial due to the critical role Azure Cosmos DB plays in cloud infrastructure and data storage. Exploitation could lead to unauthorized access to sensitive data, compromise of user sessions, and manipulation of database operations, undermining data confidentiality and integrity. This could result in data breaches, regulatory non-compliance (e.g., GDPR violations), reputational damage, and financial losses. The low availability impact suggests service disruption is less likely, but the high confidentiality and integrity impacts pose serious risks. Organizations relying on Azure Cosmos DB for critical applications or handling personal data are particularly vulnerable. The requirement for user interaction means phishing or social engineering campaigns could be used to trigger the exploit, increasing the attack surface. The absence of known exploits currently provides a window for proactive mitigation, but the high CVSS score underscores urgency. Given the cloud-based nature of the product, the threat can affect multiple sectors including finance, healthcare, government, and technology across Europe.

1. Monitor Microsoft’s official channels for patches or updates addressing CVE-2025-64675 and apply them immediately upon release. 2. Implement strict input validation and output encoding on all user inputs and outputs related to Azure Cosmos DB web interfaces to prevent script injection. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers accessing Azure Cosmos DB portals. 4. Educate users and administrators about phishing and social engineering risks to reduce the chance of user interaction triggering the exploit. 5. Use multi-factor authentication (MFA) to limit the impact of session hijacking. 6. Monitor logs and network traffic for unusual activities or attempts to exploit XSS vulnerabilities. 7. Consider isolating or restricting access to Azure Cosmos DB management interfaces to trusted networks or VPNs. 8. Conduct regular security assessments and penetration testing focused on web interface vulnerabilities. 9. If feasible, implement web application firewalls (WAF) with rules to detect and block XSS payloads targeting Azure Cosmos DB endpoints.