Vulnerabilities

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…

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.

Read at NIST National Vulnerability Database (CVE API 2.0)

Vendor

AWS

Product

aws-api-mcp-server

CVSS v3.1

7.8 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Fix

available

Weakness

CWE-863, CWE-1025

NVD status

Received

• NIST National Vulnerability Database (CVE API 2.0) (nvd.nist.gov)
• CVE-2026-125271 on this site · NVD · CVE.org · Vulnpedia

Other items that share a CVE or were clustered with this one.

1. 40
   AWS bulletin AWS 3h ago

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

   CVE-2026-125271 Amazon Web Services Anthropic