EUVD-2026-70400
GHSA-qhgm-jv25-h5h2
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/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
Network-reachable with low auth (workflow-edit); scope changes because process-wide host mutation impacts all concurrent workflows and users beyond the attacker's own session.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
n8n versions before 2.36.2 contain an expression sandbox bypass vulnerability where free identifiers in spread, computed-key, switch-case, or class-extension positions resolve against process globals. Authenticated users with workflow-edit permission can mutate host objects through expression evaluation, with changes persisting process-wide until restart.
AnalysisAI
Expression sandbox bypass in n8n before 2.36.2 allows authenticated workflow editors to escape the sandboxed evaluation environment by placing free identifiers in spread, computed-key, switch-case, or class-extension positions, which resolve against Node.js process globals instead of the restricted sandbox scope. Exploiting this flaw enables mutation of host objects - including prototype chains or environment-level state - with those changes persisting process-wide until the n8n service is restarted, affecting all concurrent workflows and users on the same instance. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid n8n account with workflow-edit permission (create or modify workflows). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H) reflects a network-reachable, low-complexity attack requiring low privileges - specifically, a valid account with workflow-edit permission. … 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 | Upgrade n8n to version 2.36.2 or later, as confirmed by the vendor advisory at https://github.com/n8n-io/n8n/security/advisories/GHSA-fg85-4wv2-p98j. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all n8n deployments and current versions (if not already tracked), then restrict workflow editor access to trusted personnel only as interim control. …
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Same weakness CWE-95 – Eval Injection
View allSame technique Code Injection
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External POC / Exploit Code
Leaving vuln.today