What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-03 · updated 2026-10-23
• Weakness: 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 products

• AWS amazon-mq-mcp-server: through 2.0.23

References

• https://aws.amazon.com/security/security-bulletins/2026-070-aws/
• https://github.com/awslabs/mcp/security/advisories/GHSA-xwj6-8x5h-hjp6
• https://pypi.org/project/awslabs.amazon-mq-mcp-server/2.0.24/

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