ORBIT maps mitigations to every OWASP MCP Top 10 risk
Sam's Dev.to post details how ORBIT, an open-source self-hosted MCP security tool, addresses all ten risks in the OWASP MCP Top 10 framework released in April 2026.
Score breakdown
Developers building MCP-connected agents can use ORBIT's compliance mapping as a concrete checklist to harden their deployments against the full OWASP MCP Top 10, including real-world attack patterns already exploited in the wild.
- 01The OWASP Foundation released the MCP Top 10 in April 2026 as a risk framework for Model Context Protocol.
- 02ORBIT addresses all 10 OWASP MCP risks with specific technical mitigations.
- 03Schema poisoning (MCP-01) is blocked by strict JSON Schema validation in `mcp_gateway.py`; the Langflow CVE-2026-33017 exploit relied on a missing `input_schema` field.
The OWASP Foundation published the MCP Top 10 in April 2026, establishing a formal risk taxonomy for Model Context Protocol — the protocol that connects AI agents to external tools. Sam's post on Dev.to presents ORBIT as a fully compliant, open-source, self-hosted solution and provides a complete mapping of each risk to a concrete mitigation. The ten risks covered are: MCP-01 (Schema Poisoning), MCP-02 (Tool Output Tampering), MCP-03 (Prompt Injection via Tools), MCP-04 (Excessive Tool Exposure), MCP-05 (Sensitive Data Leakage), MCP-06 (Insecure Communication), MCP-07 (Rate Limiting Bypass), MCP-08 (Insecure Deserialization), MCP-09 (Excessive Output Size), and MCP-10 (Unverified Tool Sources).
Unverified tool sources are handled via OPA/Rego explicit allow lists per agent.
ORBIT's mitigations are specific and technical: schema poisoning is blocked by strict JSON Schema validation in `mcp_gateway.py`; tool output integrity is enforced via SHA-256 hashing in the audit log; prompt injection is countered with description sanitization and length limits; the Capability Governor hides disallowed tools from agents; `detect_secrets.py` scans for 9 distinct secret patterns and redacts them before agent output; communication defaults to a local-first design with TLS for remote connections; a per-tool rate limiter caps requests at 1 req/sec; only safe JSON parsing is used (no `pickle`); and a configurable `max_output_size` per tool defaults to 10 MB. Unverified tool sources are handled via OPA/Rego explicit allow lists per agent.
The post also references real-world incidents to ground the risks: the Langflow `CVE-2026-33017` exploit, which relied on a missing `input_schema` field that ORBIT would reject immediately, and the Lovable incident, in which API keys were exposed due to unsanitized outputs. Additionally, ORBIT adds budget exhaustion protection — cumulative 24h/7d/30d enforcement — which the post notes is not covered by OWASP but is described as a critical gap that Microsoft AGT (Issue #42) has not addressed. ORBIT is available on GitHub at `highriseliving777/orbit` with a full compliance matrix in `OWASP_MCP_COMPLIANCE.md`.
Key facts
- 01The OWASP Foundation released the MCP Top 10 in April 2026 as a risk framework for Model Context Protocol.
- 02ORBIT addresses all 10 OWASP MCP risks with specific technical mitigations.
- 03Schema poisoning (MCP-01) is blocked by strict JSON Schema validation in `mcp_gateway.py`; the Langflow CVE-2026-33017 exploit relied on a missing `input_schema` field.
- 04`detect_secrets.py` scans for 9 distinct secret patterns and redacts them before agent output, addressing MCP-05 (Sensitive Data Leakage).