{"data":{"id":"601404a0-79d3-4d91-8c25-162ea3e0bf37","title":"CVE-2026-16584 - AWS API MCP Server Security Policy Bypass via Startup Failure","summary":"CVE-2026-16584 affects the AWS API MCP Server (awslabs.aws-api-mcp-server) for versions >= 0.2.13 and < 1.3.47. If the server fails to load its optional user-configured security policy at startup, it keeps running with the per-request policy check skipped, so AWS API operations the policy was set to deny or gate can execute without enforcement, provided fail-closed modes are not enabled. IAM permissions on the configured credentials remain in effect.","solution":"N/A -- no mitigation discussed in source.","labels":["security"],"sourceUrl":"https://aws.amazon.com/security/security-bulletins/rss/2026-063-aws/","publishedAt":"2026-07-23T15:39:32.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"high","attackType":["other"],"issueType":"vulnerability","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":["Amazon"],"affectedVendorsRaw":["AWS API MCP Server","awslabs.aws-api-mcp-server","AWS CLI"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"epssCheckedAt":null,"kevDateAdded":null,"advisoryAliases":null,"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":null,"disclosureDate":"2026-07-23T15:39:32.000Z","fixReleasedAt":null,"daysToFix":null,"fixCheckedAt":null,"capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["integrity","confidentiality"],"aiComponentTargeted":"agent","llmSpecific":false,"classifierConfidence":0.9,"researchCategory":null,"atlasIds":null,"fixes":[]}}