What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-05 · updated 2026-10-23
• Weakness: CWE-863

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.

Affected products

• AWS documentdb-mcp-server: before 1.0.12 — fixed in 1.0.12

How to fix

Upgrade to a fixed version: AWS documentdb-mcp-server 1.0.12. Check the vendor advisory for mitigations.

References

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

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