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n8n CVE-2026-56351

| EUVDEUVD-2026-38753 MEDIUM
SQL Injection (CWE-89)
2026-06-24 VulnCheck
PostgreSQL SQLi Microsoft N8n
5.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/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:X/V:X/RE:X/U:X
vuln.today AI
9.6 CRITICAL

Network-accessible with low complexity; PR:L for required authenticated workflow-creator role; scope changes to downstream database (S:C) with high confidentiality and integrity impact; no availability impact described in the advisory.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/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:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Jun 24, 2026 - 13:01 EUVD
Source Code Evidence Fetched
Jun 24, 2026 - 12:24 vuln.today
Analysis Generated
Jun 24, 2026 - 12:24 vuln.today
CVE Published
Jun 24, 2026 - 11:53 cve.org
MEDIUM 5.3

DescriptionCVE.org

n8n before version 2.4.0 contains a sql injection vulnerability in MySQL, PostgreSQL, and Microsoft SQL nodes that allows authenticated users to inject arbitrary SQL through unescaped identifier values in node configuration parameters. Attackers with workflow creation permissions can supply specially crafted table or column names to execute unauthorized database commands and compromise data integrity.

AnalysisAI

SQL injection in n8n's MySQL, PostgreSQL, and Microsoft SQL database integration nodes (all versions before 2.4.0) allows authenticated users with workflow creation permissions to execute arbitrary SQL commands against connected databases by supplying crafted identifier values - table or column names - in node configuration parameters. The nodes failed to escape SQL identifiers when constructing queries, bypassing the safety guarantees users expected from parameterized inputs and enabling injection that directly impacts downstream database confidentiality and integrity. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to n8n with workflow creation permissions
Delivery
Open or create a MySQL, PostgreSQL, or MSSQL node in a workflow
Exploit
Supply crafted SQL identifier (table or column name) in node config
Execution
Execute the workflow to trigger query construction
Persist
Injected SQL runs against the downstream database
Impact
Exfiltrate or corrupt database contents
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated n8n account that holds explicit 'workflow creation or modification' permissions - this is not a default guest or viewer role and must be deliberately assigned. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The official CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N) scores 5.3, which underrepresents the downstream database impact if exploitation succeeds - SC:H and SI:H indicate high confidentiality and integrity compromise of the subsequent database system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated n8n user who holds workflow creation permissions and has access to a configured database credential creates a new workflow database node, entering a crafted table name such as real_table; GRANT ALL PRIVILEGES ON *.* TO attacker@'%'; -- in the node configuration parameter. When the workflow executes, n8n builds the SQL query using the unsanitized identifier, causing the injected statement to execute against the connected MySQL, PostgreSQL, or MSSQL instance with the privileges of the configured database credential. …
Remediation The primary remediation is to upgrade n8n to version 2.4.0 or later, which resolves the identifier escaping flaw across all three affected database nodes (vendor advisory: https://github.com/n8n-io/n8n/security/advisories/GHSA-f3f2-mcxc-pwjx; patch commit: https://github.com/n8n-io/n8n/commit/f73fae6fe7fc34907bba102648a9997186aa4385). … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-56351 vulnerability details – vuln.today
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