CVE-2026-18954 Incorrect authorization in the aggregation pipeline tool in Amazon AWS Labs DocumentDB MCP Server
Authenticated clients can bypass read-only restrictions to perform unauthorized write operations on the database via aggregation pipelines.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18954?
CVE-2026-18954 is a medium-severity missing authorization vulnerability in AWS documentdb-mcp-server, published on 5 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-18954?
It affects 1 product.
Products include Amazon Documentdb Mcp Server.
How do I fix CVE-2026-18954?
No fix has been published for CVE-2026-18954 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-18954 being exploited?
There is no known exploitation of CVE-2026-18954 in the wild and no public exploit code.
Sources
Also known as GHSA-j694-4m5j-w8hc, GHSA-w95p-h69m-853r.