What are shadow MCP servers?
In short: Shadow MCP servers are MCP deployments that run outside formal security governance, often spun up for experiments with default credentials or permissive settings. OWASP lists them in its MCP Top 10. A gateway mitigates them with a registry of approved servers and discovery of agents and servers that never registered.
What happens?
A developer runs a local or hosted MCP server for convenience.
Nobody owns it, it has broad credentials, and no logs reach security.
How does a gateway mitigate it?
- Keep a registry with owner and environment.
- Discover unregistered servers and agents through integrations, not only through sign-up.
- Route approved traffic through the gateway and alert on the rest.
Which scored gateways document a mitigation?
| Gateway | Documented control | Source |
|---|---|---|
| NewCore | Discovers agents through read-only integrations without relying on registration. | [nc-discover] |
| Silverfort | Discovers sanctioned and rogue agents across identity providers, clouds and SaaS. | [sf-ai] |
| Mintive | Shadow MCP detection beside an approved registry. | [mint-home] |
Facts only. A gateway missing here may still mitigate the threat; we list what its public pages document.
Sources
- OWASP MCP Top 10 [owasp-mcp] read 2026-11-03
- NewCore: Discover [nc-discover] read 2026-11-03
- Silverfort AI agent security [sf-ai] read 2026-11-03
- MintMCP home (now Mintive) [mint-home] read 2026-11-03
All eight threats are listed on the threats hub.
By The Datasheet desk · Published and reviewed 2026-11-03