CVE-2026-16584 - AWS API MCP Server Security Policy Bypass via Startup Failure
Summary
The AWS API MCP Server (a tool that lets AI assistants run AWS commands on a user's account) has a security flaw where if the startup process fails to load its security policy rules, the server keeps running but stops checking those rules for the rest of its lifetime. This means an attacker could trick the startup into failing and then execute AWS operations that the policy was supposed to block. The underlying AWS account permissions still apply, but the policy-based restrictions are bypassed.
Classification
Affected Vendors
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Original source: https://aws.amazon.com/security/security-bulletins/rss/2026-063-aws/
First tracked: July 23, 2026 at 02:01 PM
Classified by LLM (prompt v3) · confidence: 92%