---
title: "CVE-2026-115413: AWS API MCP Server - Authentication Bypass"
description: "AWS API MCP Server < 1.6.0 contains an authentication bypass caused by missing token audience validation in OAuth mode, letting local users run AWS operations with server credentials via tokens issued to other applications, exploit requires local access."
url: https://panop.io/threat-heartbeat/CVE-2026-115413/
---

# CVE-2026-115413 AWS API MCP Server - Authentication Bypass

AWS API MCP Server < 1.6.0 contains an authentication bypass caused by missing token audience validation in OAuth mode, letting local users run AWS operations with server credentials via tokens issued to other applications, exploit requires local access.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.10% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-115413)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

27 October 2026

Updated

29 October 2026

Weakness

[CWE-346](https://cwe.mitre.org/data/definitions/346.html)

## Vendor fix

Upgrade to version 1.6.0 and configure expected token audience or client ID.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-115413](https://nvd.nist.gov/vuln/detail/CVE-2026-115413)
- [https://aws.amazon.com/security/security-bulletins/2026-152-aws/](https://aws.amazon.com/security/security-bulletins/2026-152-aws/)
- [https://github.com/awslabs/mcp/security/advisories/GHSA-4prq-p2x5-w9fh](https://github.com/awslabs/mcp/security/advisories/GHSA-4prq-p2x5-w9fh)
- [https://pypi.org/project/awslabs.aws-api-mcp-server/1.6.0/](https://pypi.org/project/awslabs.aws-api-mcp-server/1.6.0/)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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