CVE-2026-18954

Incorrect authorization in the aggregation pipeline tool in Amazon AWS Labs DocumentDB MCP Server

State: Published
Severity: 5.7 Medium
Published: Aug 5, 2026
Updated: Aug 6, 2026
Reserved: Aug 5, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.7 Medium	CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N	AMZN
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N	AMZN

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
documentdb-mcp-serverAWS	before 1.0.12Affected

References

https://github.com/awslabs/mcp/releases/tag/2026.04.20260408085348release-notespatch
https://aws.amazon.com/security/security-bulletins/2026-076-aws/vendor-advisory
https://github.com/awslabs/mcp/security/advisories/GHSA-j694-4m5j-w8hcrelease-notes

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