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Vulnerability record · CVE-2026-85620 · published 4 September 2026

CVE-2026-85620: Incorrect authorization vulnerability

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.

9.2 CVSS 4.0 Critical EPSS 0.51% · top 59.2% CWE-863 · Incorrect authorization Awaiting Analysis
9.2CVSS 4.0 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
24 Sep 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/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

LinkTags
https://github.com/crystaldba/postgres-mcp
https://github.com/crystaldba/postgres-mcp/blob/v0.3.0/src/postgres_mcp/sql/safe_sql.py
https://github.com/crystaldba/postgres-mcp/issues/178
https://www.vulncheck.com/advisories/postgres-mcp-pro-0.3.0-restricted-mode-bypass-via-from-clause-function

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Source: NIST National Vulnerability Database (record CVE-2026-85620), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.