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MCPJacking: 155 Hijackable MCPs Discovered Live in the Official MCP Marketplace

We discovered 155 hijackable MCPs in the official worldwide marketplace used by millions of agents. Each relied on an expired domain, so we simply registered them, published our own MCPs and gained full remote prompt execution on every agent that trusted them. Even official marketplaces carry this supply chain risk, and any enterprise using MCPs is exposed. Enterprises on Air Marketplace are not exposed to MCPjacking.

Nadav Dadush
,
Eliad Mualem
,
Roi Snir
August 27, 2026
August 27, 2026

We discovered 155 hijackable MCPs in the official worldwide marketplace used by millions of agents. Each relied on an expired domain, so we simply registered them, published our own MCPs and gained full remote prompt execution on every agent that trusted them. Even official marketplaces carry this supply chain risk, and any enterprise using MCPs is exposed. Enterprises on Air Marketplace are not exposed to MCPjacking.

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