CVE-2026-18655

DiscoveredAug 3, 2026UpdatedOct 23, 2026

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.

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CVSS v3.1

6.5 MEDIUM

EPSS

0.42%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

EPSS Trend

Aug 16, 2026 → Sep 25, 2026

▲ 0.17pp

0.25% → 0.42% over 2 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

ScopeUNCHANGED

ConfidentialityHIGH

IntegrityNONE

AvailabilityNONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Connections

2 relationships

CWE-923

source

Timeline

disclosure → media coverage

Aug 3, 2026

Disclosure — published as a CVE record. · last revised by NVD Oct 23, 2026

Aug 20, 2026

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