CVE-2026-18655

Broker Credential and OAuth Token Disclosure in AWS Labs Amazon MQ MCP Server via Prompt Injection

State: Published
Severity: 7.1 High
Published: Aug 3, 2026
Updated: Aug 3, 2026
Reserved: Aug 3, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	AMZN
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N	AMZN

Weaknesses

CWE-923 Improper Restriction of Communication Channel to Intended Endpoints

Affected Products

Product	Versions
amazon-mq-mcp-serverAWS	2.0.23 and earlierAffected

References

https://pypi.org/project/awslabs.amazon-mq-mcp-server/2.0.24/release-notespatch
https://aws.amazon.com/security/security-bulletins/2026-070-aws/vendor-advisory
https://github.com/awslabs/mcp/security/advisories/GHSA-xwj6-8x5h-hjp6release-notes

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