CVE-2025-11287 is a vulnerability identified in samanhappy MCPHub, specifically affecting versions 0.9.0 through 0.9.10. The issue resides in the handleSseConnection function within the src/services/sseService.ts file, where improper authentication logic allows remote attackers to establish Server-Sent Events (SSE) connections without proper credentials. This flaw effectively bypasses authentication controls, enabling unauthorized access to potentially sensitive real-time data streams or control interfaces exposed by MCPHub. The vulnerability requires no user interaction, privileges, or authentication, and can be exploited remotely over the network. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P) indicates low attack complexity, no required privileges or user interaction, and partial impact on confidentiality, integrity, and availability. Although the vendor was notified early, no patch or response has been provided, and public exploit code is available, increasing the risk of exploitation. MCPHub is used for managing and monitoring connected devices or services, so unauthorized access could lead to data leakage, manipulation of device states, or service disruption. No known exploits in the wild have been reported yet, but the presence of public exploit code suggests imminent risk.

For European organizations, this vulnerability poses a significant risk to operational continuity and data security, especially in sectors relying on MCPHub for device management or real-time monitoring, such as manufacturing, utilities, and smart infrastructure. Unauthorized access could lead to exposure of sensitive operational data, manipulation of device states causing process disruptions, or denial of service conditions. The lack of vendor response and patches increases the window of exposure. Organizations with MCPHub deployments in critical infrastructure or industrial control systems face heightened risk of targeted attacks aiming to disrupt services or steal intellectual property. Additionally, the vulnerability could be leveraged as a foothold for lateral movement within networks. The medium severity rating reflects the balance between the ease of exploitation and partial impact on system security, but the real-world impact could escalate depending on the deployment context and attacker objectives.

Since no official patch is available, European organizations should implement compensating controls immediately. These include: 1) Restricting network access to MCPHub services using firewalls or network segmentation to limit exposure to trusted hosts only. 2) Deploying additional authentication or access control mechanisms in front of MCPHub, such as reverse proxies with authentication enforcement or VPN requirements. 3) Monitoring network traffic and logs for unusual SSE connection attempts or unauthorized access patterns. 4) Conducting thorough audits of MCPHub deployments to identify and isolate vulnerable instances. 5) Implementing anomaly detection systems to flag suspicious behavior related to device management or data streams. 6) Preparing incident response plans specific to MCPHub compromise scenarios. 7) Engaging with the vendor or community for updates and potential unofficial patches or workarounds. These steps go beyond generic advice by focusing on network-level controls and active monitoring tailored to the nature of the vulnerability.