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CVE-2026-125271— AWS API MCP Server Security Policy Bypass via Incorrect Operation Name Normalization

Quick assessment

Affected
AWS aws-api-mcp-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 1.5.1 版本之前，自定义安全策略执行过程中对操作名称的规范化处理存在缺陷。该漏洞可能允许攻击者通过调用名称中包含连续大写字母的操作，绕过安全策略的限制，从而执行本应被策略明确拒绝或要求人工确认的跨 AWS 服务 API 操作。 为修复此问题，用户应升级至 1.5.1 版本。

CVSS 7.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS aws-api-mcp-server 0.2.13< 1.5.1 affected
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I. Basic Information for CVE-2026-125271

Vulnerability Information
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Vulnerability Title
AWS API MCP Server Security Policy Bypass via Incorrect Operation Name Normalization
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect normalization of operation names in the custom security policy enforcement in awslabs aws-api-mcp-server before 1.5.1 might allow an actor to execute AWS API operations across AWS services that the operator's security policy was configured to deny or require elicitation for, via calls to operations whose names contain consecutive capital letters. To remediate this issue, users should upgrade to version 1.5.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用错误要素进行比较
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS aws-api-mcp-server 0.2.13 ~ 1.5.1 -

II. Public POCs for CVE-2026-125271

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III. Intelligence Information for CVE-2026-125271

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Vendor Advisories for CVE-2026-125271 (2)

Other References for CVE-2026-125271 (1)

IV. Related Vulnerabilities

Same product: aws-api-mcp-server
Same vendor: AWS
Same weakness: CWE-1025