CVE-2026-18954
Bulletin ID: 2026-076-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 08/05/2026 13:00 PM PDT Description: Amazon DocumentDB MCP Server is an open-source Model Context Protocol (MCP) server that enables AI assistants to interact with Amazon DocumentDB databases. We identified CVE-2026-18954, an incorrect authorization issue where write-capable aggregation pipeline stages ($out, $merge) bypass the read-only mode enforcement logic, potentially allowing an authenticated MCP client to perform write operations on the connected database. Impacted versions: < 1.0.12 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.
CSIRTS triage
- What
- Incorrect authorization in aggregation pipeline allows write-capable stages to bypass read-only mode enforcement.
- Who is affected
- Deployments of AWS DocumentDB MCP Server versions before 1.0.12.
- Urgency
- High urgency; authenticated clients can perform unauthorized write operations on databases despite read-only mode.
- Action
- Update DocumentDB MCP Server to version 1.0.12 or later.
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Exploitation outlook
- Low exploitation risk0.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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