CVE-2025-10193 is a high-severity vulnerability affecting the neo4j-cypher MCP server version 0.2.2. The root cause is an origin validation error classified under CWE-346, which leads to a DNS rebinding attack vector. DNS rebinding is a technique that allows a malicious website to circumvent the browser's Same-Origin Policy (SOP) by manipulating DNS responses to make the victim's browser believe that the malicious site and a local service share the same origin. In this case, the neo4j-cypher MCP server does not properly validate the origin of incoming requests, allowing unauthorized invocations of its tools. The attack requires user interaction, specifically enticing the user to visit and remain on a malicious website long enough for the DNS rebinding to succeed. Once successful, the attacker can execute unauthorized commands against the locally running Neo4j MCP instance, potentially leading to unauthorized data access or manipulation. The CVSS 4.0 score of 7.4 reflects the network attack vector, the requirement for user interaction, and the high impact on confidentiality and integrity, though with high attack complexity and partial user privileges. No known exploits are currently in the wild, and no patches have been published yet, increasing the urgency for mitigation and monitoring.

For European organizations, this vulnerability poses a significant risk, especially for those using Neo4j graph database technologies in their infrastructure or applications. The ability to bypass SOP and execute unauthorized commands locally can lead to data breaches, unauthorized data manipulation, or disruption of services relying on Neo4j. Given that Neo4j is often used in data analytics, fraud detection, and network management, exploitation could compromise sensitive business intelligence and operational data. The requirement for user interaction means phishing or social engineering campaigns could be leveraged to trigger the attack, increasing the risk in environments with less stringent user awareness. Additionally, organizations with web-facing applications that integrate Neo4j or have developers accessing local Neo4j MCP servers are particularly vulnerable. The absence of patches and known exploits suggests a window of exposure, necessitating proactive defenses. The impact on confidentiality and integrity is high, while availability impact is not indicated, meaning attackers could stealthily manipulate or exfiltrate data without causing obvious service outages.

To mitigate this vulnerability, European organizations should implement several specific measures beyond generic advice: 1) Restrict access to the neo4j-cypher MCP server to trusted networks only, using firewall rules or network segmentation to prevent exposure to untrusted web origins. 2) Employ browser security policies such as Content Security Policy (CSP) and SameSite cookies to reduce the risk of DNS rebinding attacks from malicious websites. 3) Educate users about the risks of visiting untrusted websites and the importance of minimizing time spent on unknown domains, especially when working with local development environments. 4) Monitor network traffic and logs for unusual requests to the neo4j-cypher MCP server that could indicate attempted exploitation. 5) If possible, disable or restrict the neo4j-cypher MCP server on developer machines or production environments where it is not essential. 6) Stay alert for official patches or updates from Neo4j and plan immediate deployment once available. 7) Consider deploying web application firewalls (WAFs) or reverse proxies that can enforce stricter origin validation and block suspicious requests targeting the MCP server. These targeted mitigations will reduce the attack surface and limit the potential for successful exploitation until a patch is released.