Auth bypass in Amazon 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 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.
Vulnerability class: Broken Access Control
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (5.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
Weakness classification (CWE)
References
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory, Vendor Advisory)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, Release Notes, patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-18954?
- CVE-2026-18954 is a medium-severity vulnerability in Amazon 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.