Researcher finds MCP trust flaw in Google, JP Morgan agents
Independent researcher Syed Anas Mohiuddin has identified a structural vulnerability in the Model Context Protocol (MCP), a standard used for AI agents to communicate within internal networks. The flaw exploits the inherent trust between agents, allowing a compromised agent to spread malicious instructions to others, such as those handling translation or data analysis. This technique bypasses…
Key points
- Researcher Syed Anas Mohiuddin found a trust gap in MCP allowing malicious agent-to-agent instruction spreading.
- Vulnerabilities were acknowledged by Google, JP Morgan Chase, Weviate, Rapid7, and two government bodies.
- The flaw enables server-side request forgery by exploiting lax guardrails in special-purpose agents.
Mohiuddin demonstrated proof-of-concept attacks against agents from Google, JP Morgan Chase, Weviate, Rapid7, the French government’s interministerial digital directorate, and the US federal government. Over the past five months, these organizations have acknowledged vulnerabilities that allow attackers to exfiltrate sensitive data or execute unauthorized network requests, a type of server-side request forgery. The issue arises because many special-purpose agents lack robust guardrails, and MCP servers store credentials that facilitate this lateral movement within trusted internal environments.
Vulnerability in agents from Google and others exposes structural flaw in MCP
Ars Technica AI · 5 October 2026
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