EUVD-2026-90750
GHSA-6w8v-v5w3-7x56
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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:X/V:X/RE:X/U:X
Network-reachable, low-complexity IDOR exploitable by any authenticated low-priv user (PR:L); scope changes (S:C) as one account decrypts others' credentials; impact is confidentiality-only (C:H).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
6DescriptionCVE.org
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 fail to validate credential ownership during inline agent node-tool introspection. Attackers can reference arbitrary credential IDs to decrypt and exfiltrate plaintext secrets to attacker-controlled hosts without ownership verification.
Articles & Coverage 1
AnalysisAI
n8n automation instances running versions before 2.39.6 or 2.40.0 before 2.40.1 permit an authenticated attacker with low privileges to decrypt and exfiltrate stored plaintext credentials by referencing arbitrary credential IDs during inline AI agent node-tool introspection, which fails to verify credential ownership (CWE-639). Successful exploitation yields high confidentiality impact with a scope change (CVSS 3.1 base 8.3, AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N); the attacker must hold a valid account able to build or edit workflows, know or enumerate internal credential IDs, and operate an attacker-controlled host to receive the secrets. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated n8n account with at least low privileges (PR:L) and the ability to build or edit workflows that use an inline AI agent node with tool introspection. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority vulnerability for n8n operators, though not an emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to n8n 2.39.6 or later, or to 2.40.1 or later for the 2.40.x line, as documented in the GitHub advisory https://github.com/n8n-io/n8n/security/advisories/GHSA-9rhv-fhr8-7q5r and the VulnCheck advisory https://www.vulncheck.com/advisories/n8n-before-2.39.6-and-2.40-x-before-2.40.1-credential-disclosure-via-node-tool-introspection. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all n8n instances and determine which are running versions before 2.39.6 or 2.40.0 before 2.40.1, restrict account provisioning so only staff who require workflow authoring retain edit/build privileges, and review logs for unusual credential-ID references or outbound connections from n8n nodes to unknown hosts. …
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