Medium severity · published Aug 5, 2026
CVE-2026-18954
Incorrect authorization in the aggregation pipeline tool in Amazon AWS Labs DocumentDB MCP Server
5.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DO
documentdb-mcp-server · AWS
before 1.0.12 · source: vendor
DM
Documentdb Mcp Server · Amazon
before 1.0.12 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18954
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18954
Vendor Advisory
https://aws.amazon.com/security/security-bulletins/2026-076-aws/
Release Notes
https://github.com/awslabs/mcp/releases/tag/2026.04.20260408085348
Vendor Advisory
https://github.com/awslabs/mcp/security/advisories/GHSA-j694-4m5j-w8hc