CVE-2026-18655: Broker Credential and OAuth Token…

Record summary

CVE-2026-18655 has a selected CVSS score of 7.1 (high).

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.

Description source: CVE List

Exploitation context

CISA SSVC decision

ExploitationNone

AutomatableNo

Technical impactPartial

CISA Coordinator · SSVC 2.0.3 · Evaluated Aug 3, 2026 · Source: CVE List

Affected products and versions

Product	Source	Version range	Status
amazon-mq-mcp-server Browse AWS / amazon-mq-mcp-server Default status: unaffected	CVE List	Through 2.0.23	affected

References

aws.amazon.comVendor advisory

https://aws.amazon.com/security/security-bulletins/2026-070-aws

github.comrelease notes

https://github.com/awslabs/mcp/security/advisories/GHSA-xwj6-8x5h-hjp6

pypi.orgrelease notespatch

https://pypi.org/project/awslabs.amazon-mq-mcp-server/2.0.24