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Agent blindly trusts and acts on messages from other agents without semantic or schema validation

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How to resolve

Validate all incoming agent messages against an expected schema. Reject messages with unexpected fields, types, or instruction patterns.

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Risk

Governance/Compliance This vulnerability falls under ASI07:2026 — Insecure Inter-Agent Communication in the OWASP Top 10 for Agentic Applications. Agent-to-agent messages lack authentication, encryption, or semantic validation. Security Agent blindly trusts and acts on messages from other agents without semantic or schema validation. If exploited, this can compromise the agent’s integrity, confidentiality, or availability, potentially affecting downstream systems and data.

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Explanation

Agent blindly trusts and acts on messages from other agents without semantic or schema validation. This falls under ASI07 (Insecure Inter-Agent Communication): Agent-to-agent messages lack authentication, encryption, or semantic validation.

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Specifications

Trigger
  • Agent scan detects agent blindly trusts and acts on messages from other agents without semantic or schema validation
The scanner looks for patterns such as:
  • agent trusts all inputs from upstream agent without validation
  • no message schema enforcement between agents
  • inter-agent results used directly without sanity check
Severity
  • HIGH
Applies to: Agent