The Model Context Protocol has exploded in popularity with 79,000+ GitHub stars and adoption by every major AI platform. But with rapid growth comes a growing attack surface. These 6 documented breaches show why MCP security scanning is no longer optional.
A tool poisoning attack embedded a sleeper backdoor in a WhatsApp MCP server. The malicious code hid in tool metadata that appeared legitimate. Every chat message was silently forwarded to attackers.
Attackers injected prompts through public GitHub Issues. The MCP-connected AI agent processed these as legitimate instructions and leaked private repository data including financial information into public pull requests.
A broken access control flaw in an Asana MCP integration allowed reading project data from other organizations. No sophisticated exploit needed, just a misconfigured permission scope that the MCP layer failed to validate.
A compromised dependency in a Postmark MCP server silently redirected business emails to attacker-controlled servers. The supply chain attack went undetected for weeks because nobody audited the dependency tree.
A path traversal vulnerability in the largest MCP server registry exposed Docker credentials and API tokens. The registry itself became the weakest link in the chain.
Security researchers documented attackers using MCP to integrate LLMs directly into intrusion workflows, automating firewall analysis, credential extraction, and lateral movement. MCP is no longer just a target. It is becoming a weapon.
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