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How MCP Servers Can Expose Enterprise Secrets

An explainer on Model Context Protocol (MCP) security describes how ungoverned MCP servers expand the enterprise attack surface, cataloging five vectors — confused deputy, token passthrough, tool poisoning, SSRF via tool connectors, and rogue server registration — and noting MCP grants LLM runtimes ambient authority across multi-hop trust chains that identity and perimeter controls miss. The piece frames shadow AI and pre-production MCP deployments bypassing security review as the core governance gap, referencing the September 2025 Postmark malicious MCP server incident and control domains like OAuth 2.1 token exchange and server attestation. Details →

The lethal trifecta for AI agents: private data, untrusted content, and external communication

An explainer on stopping prompt injection in MCP servers frames the problem as the 'lethal trifecta' (private-data access, exposure to untrusted content, and external communication) coined by Simon Willison, using the Invariant Labs demonstration against GitHub's official MCP server as its central case. In that attack a malicious GitHub issue embedded agent-directed instructions that caused a coding agent to leak private repo details into a public pull request, with no exploited code or CVE. The piece argues the fix is architectural rather than prompt-based. Details →

Understanding ChatGPT Work

Simon Willison's teardown of OpenAI's ChatGPT Work (specifically the cloud variant, Work Cloud) argues its feature set — internet-enabled code execution, a headless Chrome browser, a persistent scratch filesystem, sub-agents, scheduled automations, and Cloudflare Workers site deploys — combines all three elements of his 'lethal trifecta': access to private data, exposure to untrusted content, and a channel to exfiltrate stolen data. Willison does not demonstrate an exploit but asks OpenAI to explain how it defends Work sessions against prompt injection, criticizing the product's opacity around system prompts and tool descriptions. Details →

Securing the Model Context Protocol (MCP): Risks, Controls, and Governance

An analysis piece synthesizing MCP (Model Context Protocol) security risks for CISOs, drawing on a Darktrace blog and an arXiv paper (arXiv:2511.20920) by Errico, Ngiam, and Sojan. It categorizes threats such as content-injection attackers embedding malicious instructions into agent-consumed data, supply-chain attackers distributing compromised MCP servers, and over-privileged agents enabling data-driven exfiltration, tool poisoning, and cross-system privilege escalation, and proposes controls including scoped per-user authentication, sandboxing, provenance tracking, DLP, and centralized governance. Details →
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