Vulnerability record · CVE-2026-87911 · published 9 September 2026

CVE-2026-87911: OS command injection vulnerability

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.

9.0 CVSS 4.0 Critical EPSS 1.7% · top 23.2% CWE-78 · OS command injectionCWE-184 · CWE-184 Deferred

9.0CVSS 4.0 base score

1.7%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

3References

10 Sep 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

Link	Tags
https://aws.amazon.com/security/security-bulletins/2026-104-aws/
https://github.com/awslabs/mcp/security/advisories/GHSA-fph8-pg5w-78fv
https://pypi.org/project/awslabs.postgres-mcp-server/1.1.7/

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Source: NIST National Vulnerability Database (record CVE-2026-87911), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.