Unauthorized data modification via SQL blocklist bypass
Published Sep 4, 2026 · Updated Sep 8, 2026
SQL validation bypass in Amazon Aurora Postgres MCP Server before 1.1.7 allows remote attackers to modify database data via crafted SQL. The read-only validation component checks submitted statements against an incomplete blocklist, allowing disallowed SQL constructs to reach PostgreSQL. Exploitation requires an authenticated user to interact with attacker-controlled content; resulting writes are bounded by the server's database role.
Summary
What happened
SQL validation bypass in Amazon Aurora Postgres MCP Server before 1.1.7 allows remote attackers to modify database data via crafted SQL. The read-only validation component checks submitted statements against an incomplete blocklist, allowing disallowed SQL constructs to reach PostgreSQL. Exploitation requires an authenticated user to interact with attacker-controlled content; resulting writes are bounded by the server's database role.
The record
- CVE
- CVE-2026-85787
- Published
- Sep 4, 2026
- Updated
- Sep 8, 2026
- Vendor
- Amazon Web Services
- Product
- Amazon Aurora Postgres MCP Server
- Classifications
- CWE-184, T1565.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 4, 2026CVE publishedPublication date reported by the CVE source.
- Sep 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <1.1.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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