CVE-2026-115413

High

Description

Missing token audience validation in the OAuth authentication mode of AWS API MCP Server before version 1.6.0 might allow local users to run AWS operations with the server's configured AWS credentials via an access token issued to another application by the same identity provider. To remediate this issue, users should upgrade to version 1.6.0 and configure the expected token audience or client ID for the server.

SeverityHigh

CVSS7.8

Exploit probability—

ProductAws-api-mcp-server

PublishedOct 27, 2026

First seenOct 27, 2026

Weakness typeCWE-346CWE-346

How to fix

Update

AWS aws-api-mcp-server1.6.0 or later

Patches

pypi.org/project/awslabs.aws-api-mcp-server/1.6.0/

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-152-aws/

Affected products

Product	Affected versions	Fixed in
AWS aws-api-mcp-server	1.3.0 ≤ v < 1.6.0	1.6.0

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