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

Quick assessment

Affected
AWS amazon-mq-mcp-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Amazon Open source MCP servers for AWS是美国Amazon公司的一款亚马逊云服务连接的模块集合。 Amazon Open source MCP servers for AWS 2.0.24之前版本存在授权问题漏洞，该漏洞源于对预期端点限制不当，可能导致远程未认证攻击者通过提示注入获取发送到由MCP客户端上下文中broker主机名控制的特制端点的Amazon MQ for RabbitMQ broker凭据或OAuth访问令牌。

CVSS 6.5 · Medium EPSS 0.25% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS amazon-mq-mcp-server ≤ 2.0.23 affected
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I. Basic Information for CVE-2026-18655

Vulnerability Information
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Vulnerability Title
Broker Credential and OAuth Token Disclosure in AWS Labs Amazon MQ MCP Server via Prompt Injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道对预期端点的不适当限制
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon Open source MCP servers for AWS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon Open source MCP servers for AWS是美国Amazon公司的一款亚马逊云服务连接的模块集合。 Amazon Open source MCP servers for AWS 2.0.24之前版本存在授权问题漏洞，该漏洞源于对预期端点限制不当，可能导致远程未认证攻击者通过提示注入获取发送到由MCP客户端上下文中broker主机名控制的特制端点的Amazon MQ for RabbitMQ broker凭据或OAuth访问令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS amazon-mq-mcp-server 0 ~ 2.0.23 -

II. Public POCs for CVE-2026-18655

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III. Intelligence Information for CVE-2026-18655

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Vendor Advisories for CVE-2026-18655 (2)

Other References for CVE-2026-18655 (1)

Same Patch Batch · AWS · 2026-08-03 · 3 CVEs total

CVE-2026-18733 8.8 HIGH Prompt injection bypasses shell tool consent gate in Strands Agents Tools
CVE-2026-18654 6.8 MEDIUM Disabled SSH host key verification in Amazon AWS CLI EMR helper commands

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-923

V. Comments for CVE-2026-18655

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