CVE-2026-85620: Incorrect Authorization in crystaldba postgres-mcp
Description
Postgres MCP Pro 0.3.0 contains a restricted-mode bypass vulnerability where function-name validation is not applied to RangeFunction nodes in FROM clauses. Attackers can execute file-reading functions like pg_read_file through FROM-clause syntax to read arbitrary files despite restricted-mode protections.
CVSS v4.0
Score 9.2critical
Affected software
crystaldba
postgres-mcp
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Postgres MCP Pro versions up to and including 0.3.0 contain an incorrect authorization vulnerability where function-name validation is not enforced on RangeFunction nodes within FROM clauses. This flaw permits attackers to invoke file-reading functions like pg_read_file despite restricted-mode restrictions, leading to unauthorized file access. The vulnerability has a CVSS 4.0 score of 9.2, indicating a critical severity with network attack vector, no privileges or user interaction required, and high impact on confidentiality and security capabilities.
Potential Impact
Exploitation of this vulnerability allows remote attackers to read arbitrary files on the affected system without authentication or user interaction, bypassing restricted-mode protections. This can lead to disclosure of sensitive information and compromise of system confidentiality and security.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the affected software and monitor for suspicious activity related to FROM-clause function usage.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-04T11:03:33.315Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9adb41acd9273b49bef506
Added to database: 09/04/2026, 14:52:49 UTC
Last enriched: 09/14/2026, 22:40:27 UTC
Last updated: 10/19/2026, 18:48:24 UTC
Views: 129
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