AWS and Vercel Patch Critical Flaws in AI Agent Platforms Allowing Unauthorized Tool Execution
AWS and Vercel have patched several critical vulnerabilities affecting platforms that power AI agents. The flaws allowed malicious actors to execute tools without proper authorization from the underlying model.
The vulnerabilities belong to a broader attack pattern researchers named CoreBreak. The core issue occurred when infrastructure treated a user-supplied tool call as evidence that the action had been generated and approved by the AI agent itself.
AWS Bedrock AgentCore Impact
In AWS, CVE-2026-18830 affected the InvokeHarness API of Amazon Bedrock AgentCore. An authenticated user could append a specially crafted tool invocation to the end of a request and directly trigger any tools available in the environment without the model reviewing or approving the operation.
Vercel Sandbox Escape Issues
Vercel addressed two vulnerabilities recorded as CVE-2026-64650 and CVE-2026-64651. These issues allowed code running inside a Linux sandbox to reach tools present on the host system. Depending on configured permissions, an attacker could read secrets, interact with cloud APIs, or perform deployment-related operations.
The flaws increased the risk posed by malicious code processed by AI coding agents. No confirmed cases of real-world exploitation have been reported publicly.
Security teams should update affected components, limit the set of tools exposed to agents, and treat conversation history, events, and external calls as untrusted input.
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