Amazon AWS Labs DocumentDB MCP Server 1.0.11 Aggregation Pipeline Auth Bypass
CVE-2026-18954 Published on August 5, 2026
Incorrect authorization in the aggregation pipeline tool in Amazon AWS Labs DocumentDB MCP Server
Incorrect authorization in the aggregation pipeline tool in Amazon AWS Labs DocumentDB MCP Server before 1.0.12 might allow an authenticated MCP client to perform inappropriate write operations on the connected database via write-capable aggregation pipeline stages that bypass the read-only mode enforcement logic.
To remediate this issue, users should upgrade to version 1.0.12 or later.
Vulnerability Analysis
CVE-2026-18954 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-18954 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-18954
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Affected Versions
AWS documentdb-mcp-server:- Before 1.0.12 is affected.