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ATR-2026-00063criticalTool Poisoningexperimental

Multi-Skill Chain Attack

Detects attack sequences where multiple MCP skills are chained together to achieve a malicious outcome that no single skill could accomplish alone. For example: (1) a reconnaissance skill reads sensitive files, (2) an encoding skill obfuscates the data, (3) a network skill exfiltrates it. Each step appears benign individually but the chain constitutes data exfiltration.

Severity
critical
Category
Tool Poisoning
Scan Target
mcp
Author
ATR Community

Response Actions

block toolalertsnapshotescalate

References

OWASP Agentic
ASI02:2026 - Tool Misuse and Exploitation
OWASP LLM
LLM03:2025 - Supply Chain VulnerabilitiesLLM06:2025 - Excessive Agency
MITRE ATLAS
AML.T0024 - Exfiltration via ML Inference APIAML.T0053 - LLM Plugin Compromise