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TI-2026-42351 Aliases CVE-2026-59206GHSA-75qm-gp28-rcq9

n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration

Priority LOW 32CWE-1321Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

n8n is an open source workflow automation platform. Prior to 1.123.61, 2.27.4, and, 2.28.1, an authenticated user with the default workflow:create permission could pollute Object.prototype through a crafted workflow saved, updated, or imported via the workflow API, allowing unauthenticated requests to be treated as a privileged user and exposing user and project listing endpoints. This issue is fixed in versions 1.123.61, 2.27.4, and 2.28.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0066 51st percentileScored 2026-11-07
Fix Fixed n8n (n8n-io): 2.28.1, 2.27.4, 1.123.61n8n (npm): 1.123.61, 2.28.1, 2.27.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
n8nn8n2.28.0 to before 2.28.1; 2.0.0-rc.0 to before 2.27.4; before 1.123.612.28.1, 2.27.4, 1.123.61Patch availableCNA
—n8n (npm)before 1.123.611.123.61Patch availableGHSA-75qm-gp28-rcq9
—n8n (npm)2.28.0 to before 2.28.12.28.1Patch availableGHSA-75qm-gp28-rcq9
—n8n (npm)2.0.0-rc.0 to before 2.27.42.27.4Patch availableGHSA-75qm-gp28-rcq9
  • n8n Vendorn8n Affected 2.28.0 to before 2.28.1; 2.0.0-rc.0 to before 2.27.4; before 1.123.61 Fixed in 2.28.1, 2.27.4, 1.123.61 Patch available CNA
  • n8n (npm) Vendor— Affected before 1.123.61 Fixed in 1.123.61 Patch available GHSA-75qm-gp28-rcq9
  • n8n (npm) Vendor— Affected 2.28.0 to before 2.28.1 Fixed in 2.28.1 Patch available GHSA-75qm-gp28-rcq9
  • n8n (npm) Vendor— Affected 2.0.0-rc.0 to before 2.27.4 Fixed in 2.27.4 Patch available GHSA-75qm-gp28-rcq9

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*before 1.123.61; 2.0.0 to before 2.27.4Vulnerablen8n
cpe:2.3:a:n8n:n8n:2.28.0:*:*:*:*:node.js:*:*2.28.0Vulnerablen8n
  • cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* Versions before 1.123.61; 2.0.0 to before 2.27.4 Vulnerable ·n8n
  • cpe:2.3:a:n8n:n8n:2.28.0:*:*:*:*:node.js:*:* Versions 2.28.0 Vulnerable ·n8n

Remediation

  • Fix · CNA n8n (n8n-io) Fixed in 2.28.1, 2.27.4, 1.123.61
  • Fix · GHSA-75qm-gp28-rcq9 n8n (npm) Fixed in 1.123.61 Advisory →
  • Fix · GHSA-75qm-gp28-rcq9 n8n (npm) Fixed in 2.28.1 Advisory →
  • Fix · GHSA-75qm-gp28-rcq9 n8n (npm) Fixed in 2.27.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59206
  2. 2026-10-03 Alias added: GHSA-75qm-gp28-rcq9
  3. 2026-10-07 EPSS moved to the 50th–90th percentile

References

Advisory 2

Other 3

  • TI-2025-42131 n8n Vulnerable to Remote Code Execution via Expression Injection KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-17560 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling CVSS 3.1CRITICAL 10.0
  • TI-2026-01167 Authenticated users can bypass the Expression sandbox mechanism to achieve full remote… CVSS 3.1CRITICAL 9.9
  • TI-2026-00644 Sandbox escape in n8n Python task runner allows for arbitrary code execution on the underlying host. CVSS 3.1CRITICAL 9.9
  • TI-2025-35293 An arbitrary file upload vulnerability in the Chat Trigger component of N8N v1.95.3… CVSS 3.1HIGH 8.8
  • TI-2023-12275 The n8n package 0.218.0 for Node.js allows Escalation of Privileges. CVSS 3.1HIGH 8.8
See all 178 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences