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n8n CVE-2026-56350

| EUVDEUVD-2026-40443 MEDIUM
Improper Authorization (CWE-285)
2026-06-30 VulnCheck GHSA-j7c2-5x6r-g9w8
Authentication Bypass N8n
6.0
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

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

Network-exploitable via API with any SSO session (PR:L); no user interaction; integrity-only impact as auth policy is modified, no confidentiality or availability effect.

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

Lifecycle Timeline

2
Patch available
Jul 01, 2026 - 02:16 EUVD
Analysis Generated
Jun 30, 2026 - 23:36 vuln.today

DescriptionCVE.org

n8n before 2.8.0 contains an authentication bypass vulnerability allowing authenticated SSO users to disable SSO enforcement through the API. Attackers can create local password credentials to authenticate directly, bypassing organizational SSO policies and identity-provider-enforced multi-factor authentication.

AnalysisAI

SSO enforcement bypass in n8n before 2.8.0 allows any authenticated SSO user to disable organization-wide SSO enforcement via the API, then register a local password credential, permanently decoupling their account from the identity provider. This defeats identity-provider-enforced MFA and enables persistent access that survives SSO policy changes or user deprovisioning in the IdP. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to n8n with valid SSO session
Delivery
Call n8n API to disable SSO enforcement
Exploit
Register local password credential on attacker-controlled account
Execution
Authenticate via local credential, bypassing IdP
Impact
Maintain persistent access independent of SSO policy or IdP deprovisioning
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Vulnerability AssessmentAI

Exploitation Exploitation requires: (1) the target n8n instance must have SSO enforcement actively configured and enabled - this is an enterprise/self-hosted configuration, not the default state; (2) the attacker must hold a currently valid SSO session to n8n (i.e., PR:L - low-privilege authenticated user). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N) scores 6.0, reflecting high integrity impact with low attacker prerequisites beyond holding any valid SSO session. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who holds a valid SSO session - such as a current or recently terminated employee with an active IdP account - sends an API request to n8n to disable SSO enforcement. They then register a local username-and-password credential tied to their account. …
Remediation The primary fix is to upgrade n8n to version 2.8.0 or later, which is the confirmed remediation boundary per the vendor security advisory GHSA-vjf3-2gpj-233v at https://github.com/n8n-io/n8n/security/advisories/GHSA-vjf3-2gpj-233v. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-56350 vulnerability details – vuln.today
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