Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-16584— AWS API MCP Server Security Policy Bypass via Startup Failure

Quick assessment

Affected
AWS aws-api-mcp-server
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Amazon Open source MCP servers for AWS是美国Amazon公司的一款亚马逊云服务连接的模块集合。 Amazon Open source MCP servers for AWS 0.2.13版本至1.3.46版本存在异常处理不当漏洞，该漏洞源于初始化失败处理不当，可能导致攻击者绕过用户配置的安全策略并执行策略设置为拒绝或门控的AWS API操作。

CVSS 7.0 · High EPSS 0.23% · P12

Possible ATT&CK Techniques 2 AI

T1078 · Valid Accounts T1562

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS aws-api-mcp-server 0.2.13< 1.3.47 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-16584

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
AWS API MCP Server Security Policy Bypass via Startup Failure
Source: CVE Program / CVE List V5
Vulnerability Description
Improper handling of an initialization failure in AWS API MCP Server from 0.2.13 through 1.3.46 might allow an actor to bypass the user-configured security policy and execute AWS API operations that the policy was set to deny or gate. When initialization of the security policy enforcement data fails at server startup, the policy check is skipped for the lifetime of the process. IAM permissions on the configured credentials remain in effect and are unaffected. To remediate this issue, users should upgrade to version 1.3.47.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
初始化失效后的不存在变量
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon Open source MCP servers for AWS 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon Open source MCP servers for AWS是美国Amazon公司的一款亚马逊云服务连接的模块集合。 Amazon Open source MCP servers for AWS 0.2.13版本至1.3.46版本存在异常处理不当漏洞，该漏洞源于初始化失败处理不当，可能导致攻击者绕过用户配置的安全策略并执行策略设置为拒绝或门控的AWS API操作。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS aws-api-mcp-server 0.2.13 ~ 1.3.47 -

II. Public POCs for CVE-2026-16584

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
claude_code · 11550 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-16584

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-16584 (2)

Same Patch Batch · AWS · 2026-07-23 · 3 CVEs total

CVE-2026-16756 7.5 HIGH Allocation of resources without limits in the default aws-smithy-http-server serve() path
CVE-2026-16796 7.3 HIGH Improper neutralization of argument delimiters in AWS Bedrock AgentCore Python SDK install

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-455

V. Comments for CVE-2026-16584

No comments yet

Leave a comment