What is CVE-2026-18954?

CVE-2026-18954 is a medium-severity vulnerability in Aws Documentdb-mcp-server, classified under Incorrect Authorization. CVSS score: 5.5/10. Published 2026-08-05.

How severe is CVE-2026-18954?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Auth bypass in Aws Documentdb-mcp-server

CVE-2026-18954

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 a…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Aws Documentdb-mcp-server — versions 0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, patch)

Frequently asked questions

What is CVE-2026-18954?: CVE-2026-18954 is a medium-severity vulnerability in Aws Documentdb-mcp-server, classified under Incorrect Authorization. CVSS score: 5.5/10. Published 2026-08-05.
How severe is CVE-2026-18954?: Medium severity. CVSS v3 base score is 5.5 out of 10.