Medium severity · published Aug 3, 2026
CVE-2026-18655
Broker Credential and OAuth Token Disclosure in AWS Labs Amazon MQ MCP Server via Prompt Injection
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AM
amazon-mq-mcp-server · AWS
through 2.0.23 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18655
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18655
aws.amazon.com
https://aws.amazon.com/security/security-bulletins/2026-070-aws/
github.com
https://github.com/awslabs/mcp/security/advisories/GHSA-xwj6-8x5h-hjp6
pypi.org
https://pypi.org/project/awslabs.amazon-mq-mcp-server/2.0.24/