CVE-2026-102243 in SurfSense
Summary
by MITRE • 09/29/2026
A vulnerability was identified in MODSetter SurfSense up to 2.0.3. This issue affects some unknown processing of the file /api/search-source/connectors/mcp/test of the component MCP Connector Integration. Such manipulation leads to command injection. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified within MODSetter SurfSense versions up to 2.0.3 represents a critical security flaw located specifically within the MCP Connector Integration component, which is responsible for handling external model context protocol connections. The core of the issue resides in the processing logic associated with the API endpoint /api/search-source/connectors/mcp/test. This specific interface point serves as an entry vector where user-supplied input is processed without adequate sanitization or validation mechanisms. Consequently, this architectural weakness allows attackers to inject arbitrary operating system commands directly into the underlying server environment. The flaw is classified under CWE-78 Improper Neutralization of Special Elements used in an OS Command, commonly known as command injection, which remains one of the most severe and impactful vulnerability categories due to its potential for complete system compromise.
The operational impact of this vulnerability is profound given that it can be exploited remotely by unauthenticated attackers over a network connection. This remote exploitability significantly lowers the barrier to entry for malicious actors, enabling them to achieve arbitrary code execution on the affected server with the privileges granted to the application process. The availability of public exploits further exacerbates the risk landscape, as automated scanning tools and opportunistic attackers can leverage these ready-made payloads to compromise systems without requiring custom development efforts. In a typical deployment scenario involving SurfSense, such command injection could lead to data exfiltration, lateral movement within the network infrastructure, or the establishment of persistent backdoors, effectively granting adversaries full control over the compromised host.
From a threat intelligence perspective, this vulnerability aligns with ATT&CK technique T1059 Command and Scripting Interpreter, specifically regarding the execution of system commands to achieve initial access or privilege escalation. The lack of response from the vendor despite early notification highlights a critical gap in the supply chain security posture for MODSetter SurfSense users. Without an official patch or mitigation guidance provided by the developer, organizations relying on this software face prolonged exposure to active exploitation attempts. This situation underscores the importance of continuous monitoring and proactive defense strategies when dealing with unmaintained third-party components that handle sensitive integrations.
To mitigate the risks associated with this vulnerability in the absence of a vendor-provided fix, immediate defensive measures must be implemented at the network perimeter and host level. Deploying Web Application Firewalls configured to detect and block common command injection patterns can provide an effective layer of defense against automated attacks targeting the /api/search-source/connectors/mcp/test endpoint. Additionally, restricting access to this API interface through strict IP whitelisting or multi-factor authentication mechanisms can significantly reduce the attack surface by limiting exposure to trusted sources only. It is also advisable to isolate the affected component within a restricted network segment and monitor system logs for any signs of unauthorized command execution or anomalous process creation that may indicate an ongoing exploitation attempt until a secure version of the software becomes available.