Is CVE-2026-18954 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-18954?

CVE-2026-18954 has a CVSS v3 severity of MEDIUM (5.5).

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CVE-2026-18954

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.