Server-side request forgery (SSRF) in the server registration and update API in Amazon mcp-gateway-registry before 1.35.0 might allow an authenticated remote user to send requests from the gateway to internal network services and cloud instance metadata endpoints and read the responses via a crafted request.
To remediate this issue, users should upgrade to version 1.35.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://aws.amazon.com/security/security-bulletins/2026-180-aws/
ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/agentic-community/mcp-gateway-registry/releases/tag/1.35.0
ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/agentic-community/mcp-gateway-registry/security/advisories/G…
ff89ba41-3aa1-4d27-914a-91399e9639e5