# CVE-2026-18655: Broker Credential and OAuth Token Disclosure in AWS Labs Amazon MQ MCP Server via Prompt Injection

> CVE-2026-18655: Broker Credential and OAuth Token Disclosure in AWS Labs Amazon MQ MCP Server via Prompt Injection. CVSS 6.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-18655
Last updated: 2026-10-23T21:10:00Z

- Published: 2026-08-03 19:04 UTC · Updated: 2026-10-23 21:10 UTC · Assigner: AMZN
- CVSS: 6.5 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- EPSS: 0.42%, 36th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-923

## Description

Improper restriction of intended endpoints in the RabbitMQ broker connection tools of the Amazon MQ MCP Server (awslabs.amazon-mq-mcp-server) before 2.0.24 may allow a remote unauthenticated actor (via prompt injection) to obtain Amazon MQ for RabbitMQ broker credentials or OAuth access tokens sent to a crafted endpoint controlled through a broker hostname introduced in the MCP client context. To remediate this issue, users should upgrade to version 2.0.24.

## Affected vendors and products

- AWS: amazon-mq-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-2026-18655)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-18655)
- [https://aws.amazon.com/security/security-bulletins/2026-070-aws/](https://aws.amazon.com/security/security-bulletins/2026-070-aws/)
- [https://github.com/awslabs/mcp/security/advisories/GHSA-xwj6-8x5h-hjp6](https://github.com/awslabs/mcp/security/advisories/GHSA-xwj6-8x5h-hjp6)
- [https://pypi.org/project/awslabs.amazon-mq-mcp-server/2.0.24/](https://pypi.org/project/awslabs.amazon-mq-mcp-server/2.0.24/)

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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-2026-18655 · Markdown: https://rewindex.com/cve/CVE-2026-18655.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-18655 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:46:03.906Z