# CVE-2026-115413: AWS API MCP Server OAuth Token Audience Validation Bypass

> CVE-2026-115413: AWS API MCP Server OAuth Token Audience Validation Bypass. CVSS 7.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-115413
Last updated: 2026-10-28T14:10:17Z

- Published: 2026-10-27 18:10 UTC · Updated: 2026-10-28 14:10 UTC · Assigner: AMZN
- CVSS: 7.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS: 0.10%, 1th percentile (scored 2026-11-04)
- CISA KEV: no
- CWE: CWE-346

## 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.

## Affected vendors and products

- AWS: aws-api-mcp-server

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-115413)
- [NVD entry](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/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-115413 · Markdown: https://rewindex.com/cve/CVE-2026-115413.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-115413 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-05T14:50:35.187Z