EUVD-2026-90648
GHSA-w2h3-gf8c-fwgw
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/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
Authenticated workflow-creator (PR:L); AC:H reflects the required traversal-sequence crafting (vendor AT:P); S:C because forgery crosses the project authorization boundary; integrity-only (approval forgery), no C or A impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a path traversal vulnerability in signed resume URL generation for Send-and-Wait approvals. Attackers with workflow creation permissions can mint valid approval URLs for gates in projects they cannot access by exploiting unresolved traversal sequences in caller-controlled node IDs, enabling cross-project approval forgery.
Articles & Coverage 1
AnalysisAI
Cross-project approval forgery in n8n's Send-and-Wait approval feature allows an authenticated attacker with workflow-creation permissions to mint valid signed resume URLs for approval gates in projects they cannot access by supplying caller-controlled node IDs that contain unresolved path-traversal sequences. Affected releases are n8n before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1; the issue is meaningful primarily in multi-project or multi-tenant deployments where project isolation is relied upon as a security boundary. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated account with workflow-creation permissions in at least one n8n project (PR:L), and specifically targets the Send-and-Wait approval feature's signed resume-URL generation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but moderate-severity, low-likelihood-of-mass-exploitation issue. … 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 1.123.80 or later for the 1.x line, 2.39.6 or later for the 2.0.0 through 2.39.x line, and 2.40.1 for the 2.40.0 release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every n8n instance in the environment, record the running release line, and immediately upgrade any shared or multi-tenant deployment where project isolation is relied upon as a boundary to its corresponding fixed version: 1.123.80 on the 1.x line, 2.39.6 on the 2.x line from 2.0.0, or 2.40.1 on the 2.40.x line. …
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
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