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CVE-2026-16584 high CVSS 7.0

Vulnerability in Amazon awslabs.aws-api-mcp-server (CVE-2026-16584)

Summary

Vulnerability in Amazon awslabs.aws-api-mcp-server (CVE-2026-16584). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 1.3.47 or later.

Original description

The description as published by the source.

Summary

The AWS API MCP Server is an open source Model Context Protocol (MCP) server that enables AI assistants to interact with AWS services and resources through AWS CLI commands. It provides programmatic access to manage your AWS infrastructure while maintaining proper security controls. It includes an optional, user-configured security policy that can deny or gate specific AWS operations. An issue exists where, if the data used to enforce this policy fails to initialize at server startup, the per-request policy check is silently skipped for the lifetime of the process.

Impact

On startup, the server loads data used to enforce the configured security policy. If that load fails, the server continues running without the enforcement data in place. In the default configuration, the per-request security check is then bypassed for the lifetime of the process: configured deny and gate rules are not consulted, and AWS API operations the policy was intended to restrict execute without enforcement. The scope is limited to the security-policy gate; IAM permissions on the configured credentials remain in effect and continue to bound what the server can do.

Impacted versions: >= 0.2.13 AND < 1.3.47

Patches

This issue has been addressed in awslabs.aws-api-mcp-server version 1.3.47. AWS recommends upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.

Workarounds

Any one of the following prevents the bypas…

Source: AWS Security Bulletins NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-16584 has been found in Amazon awslabs.aws-api-mcp-server.
Successful exploitation can lead to full system takeover. CVSS score: 7.0/10.
What to do: upgrade Amazon awslabs.aws-api-mcp-server to 1.3.47 or later.
If unsure, ask your IT team or search "Amazon awslabs.aws-api-mcp-server CVE-2026-16584" on the vendor's site.

CVE-2026-16584 (Amazon awslabs.aws-api-mcp-server) — CWE-455 / CVSS v3 7.0
Attack vector: local / unauthenticated
Patched: 1.3.47 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-455) exists in Amazon awslabs.aws-api-mcp-server.

📍 Affected scope

Check the vendor advisory for the affected versions of Amazon awslabs.aws-api-mcp-server.

🔥 Severity

Severity: High (CVSS 7.0/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 1.3.47.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'awslabs.aws-api-mcp-server' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'awslabs.aws-api-mcp-server' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で awslabs.aws-api-mcp-server を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade Amazon awslabs.aws-api-mcp-server to 1.3.47

    ステージング環境で 1.3.47 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip awslabs.aws-api-mcp-server
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.47"}]}]
PyPI awslabs-aws-api-mcp-server
[{"type":"ECOSYSTEM","events":[{"introduced":"0.2.13"},{"fixed":"1.3.47"}]}]

References

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