CVE-2026-85787 Amazon CVE debrief

Who should care

Defenders responsible for Amazon awslabs postgres-mcp-server systems should assess exposure and prioritize upgrading to version 1.1.7 or above. They should also review and update their inventory of affected systems, monitor for potential exploitation attempts, and verify affected versions. Security teams and vulnerability management teams should track exceptions, retest remediated assets, and close the item only after evidence is documented.

Why it matters

CVE-2026-85787 is a HIGH severity vulnerability in Amazon awslabs postgres-mcp-server that might allow unauthenticated data modification. Defenders should assess exposure, prioritize upgrading to version 1.1.7 or above, and monitor for potential exploitation attempts. Evidence is limited, and further verification is required.

• Potential data modification beyond read-only scope
• Need to verify affected versions and upgrade to 1.1.7 or above
• Possible exploitation attempts require monitoring

Technical summary

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. The vulnerability has a HIGH severity with a CVSS score of 7.1. Users should upgrade to version 1.1.7 or above to remediate this issue. The CVE record was published on 2026-09-04T21:17:27.057Z and has not been modified since then.

Defensive priority

Upgrade to version 1.1.7 or above

Recommended defensive actions

• Upgrade to version 1.1.7 or above
• Review and update inventory of affected systems
• Monitor for potential exploitation attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability in Amazon awslabs postgres-mcp-server before version 1.1.7. Evidence is limited, and further verification is required to assess exposure and potential exploitation attempts. Defenders should verify affected versions and upgrade to 1.1.7 or above. The vulnerability might allow unauthenticated actors to modify data beyond the read-only scope by placing crafted SQL into the content submitted when an authenticated user interacts with the MCP server.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.