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CVE-2026-59206

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

HIGH
7.1
CVSS Score
Published: July 9, 2026 at 03:30 PM UTC
Updated: October 25, 2026 at 05:10 PM UTC
2 products affected across 2 vendorsN8NN8N

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Severity
HIGH7.1
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

N8N· N8Nnpm
95%
v < 1.123.612.0.0 ≤ v < 2.27.42.28.0
Affected range stops below 1.123.61, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.27.4, so it looks safe — our inference, not a vendor statement
N8N· N8N Io
90%
v < 1.123.61
Affected range stops below 1.123.61, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.27.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.28.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMVendor Advisory
Source: cverecord
https://github.com/n8n-io/n8n/security/advisories/GHSA-75qm-gp28-rcq9
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/n8n-io/n8n/releases/tag/n8n%402.27.4
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/n8n-io/n8n/releases/tag/n8n%402.28.1

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHGitHub_M
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1321

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