CVE-2026-87911

Read-only enforcement bypass enabling operating system command execution in the SQL validation component of Amazon awslabs postgres-mcp-server

Published: Sep 9, 2026Updated: Sep 10, 2026 Sources: CVE List NVDCWE-78

9.6CRITICAL

Description

An OS command injection weakness in the read-only enforcement of the SQL validation component in Amazon awslabs postgres-mcp-server before 1.1.7 might allow an unauthenticated actor to execute operating system commands on the host of a self-managed PostgreSQL server by placing a crafted COPY ... TO PROGRAM statement into content that is processed when an authenticated user interacts with the MCP server in its default read-only mode. To remediate this issue, users should upgrade to version 1.1.7 or later.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-78 CWE-184

Affected Products

AWS

commercial·US

AWS Labs postgres MCP ServerMixed

Cloud & SaaS / cloud-platform

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Execution

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References

https://pypi.org/project/awslabs.postgres-mcp-server/1.1.7/

pypi.org

https://aws.amazon.com/security/security-bulletins/2026-104-aws/

aws.amazon.com

https://github.com/awslabs/mcp/security/advisories/GHSA-fph8-pg5w-78fv

github.com

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