CVE-2026-18655

mediumCVSS 6.5covered by 2 sourcesfirst seen 2026-08-03

Bulletin ID: 2026-070-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 08/03/2026 12:00 PM PDT Description: AWS Amazon MQ MCP Server (awslabs.amazon-mq-mcp-server) is a Model Context Protocol server that enables AI assistants to interact with Amazon MQ message brokers. We identified CVE-2026-18655, an 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 that may allow a remote unauthenticated actor 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. Impacted versions: <= 2.0.23 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

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Exploitation outlook

Low exploitation risk0.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all EPSS-scored CVEs.

Advisory coverage (2)

mediumCVE-2026-18655: Improper restriction of intended endpoints in the RabbitMQ broker connection tools of the Amaz…nvd · 2026-08-03
unknownCVE-2026-18655 - Broker Credential and OAuth Token Disclosure in AWS Labs Amazon MQ MCP Server via Prompt Inje…aws · 2026-08-03

External references

NVD record for CVE-2026-18655

CVE.org record

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