CVE-2026-59206

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

State: Published
Severity: 7.1 High
Published: Jul 9, 2026
Updated: Jul 9, 2026
Reserved: Jul 2, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:L/SI:L/SA:N	GitHub_M

Weaknesses

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Affected Products

Product	Versions
n8nn8n-io	>= 2.28.0, < 2.28.1Affected >= 2.0.0-rc.0, < 2.27.4Affected < 1.123.61Affected

References

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