CVE-2026-18954 - Incorrect authorization in the aggregation pipeline tool in Amazon AWS Labs DocumentDB MCP Server

Bulletin ID: 2026-076-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 08/05/2026 13:00 PM PDT Description: Amazon DocumentDB MCP Server is an open-source Model Context Protocol (MCP) server that enables AI assistants to interact with Amazon DocumentDB databases. We identified CVE-2026-18954, an incorrect authorization issue where write-capable aggregation pipeline stages ($out, $merge) bypass the read-only mode enforcement logic, potentially allowing an authenticated MCP client to perform write operations on the connected database. Impacted versions:
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