Amazon Postgres-MCP-Server SQL Injection 1.1.6
CVE-2026-85787 Published on September 4, 2026
An incomplete list of disallowed inputs in the SQL validation component of Amazon awslabs postgres-mcp-server
An incomplete list of disallowed inputs in the SQL validation component in Amazon awslabs postgres-mcp-server before version 1.1.7 might allow an unauthenticated actor to modify data beyond the read-only scope by placing crafted SQL into the content that is submitted when an authenticated user interacts with the MCP server.
To remediate this issue, users should upgrade to version 1.1.7 or above.
Vulnerability Analysis
CVE-2026-85787 can be exploited with network access. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is a Denylist / Deny List Vulnerability?
The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses. Developers often try to protect their products against malicious input by performing tests against inputs that are known to be bad, such as special characters that can invoke new commands. However, such lists often only account for the most well-known bad inputs. Attackers may be able to find other malicious inputs that were not expected by the developer, allowing them to bypass the intended protection mechanism.
CVE-2026-85787 has been classified to as a Denylist / Deny List vulnerability or weakness.
Products Associated with CVE-2026-85787
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Affected Versions
Amazon postgres-mcp-server:- Before 1.1.7 is affected.