CVE-2026-115413

HIGH7.8

AWS API MCP Server OAuth Token Audience Validation Bypass

Published Oct 27, 2026

Modified Today

Details

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.

References

ADVISORY

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

ADVISORY

https://github.com/awslabs/mcp/security/advisories/GHSA-4prq-p2x5-w9fh

FIX

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

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-115413

CVSS Analysis

CVSS v4.0