CVE-2026-59206 | n8n is an open source workflow automation platform. Prior to… | CVSS 7.1 HIGH

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.

Metadata

CVE ID: CVE-2026-59206
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-07-02 21:05 UTC
Published: 2026-07-09 15:30 UTC
Last updated: 2026-07-09 18:38 UTC
Primary CWE: CWE-1321
CWE-1321: Improperly Controlled Modification of Object Proto…
Vendor / Product: n8n-io / n8n
Sources: cve.org · NVD

Severity & Metrics

7.1 HIGH CVSS 4.0

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
n8n-io	n8n	—	>= 2.28.0, < 2.28.1, >= 2.0.0-rc.0, < 2.27.4, < 1.123.61

Weakness (CWE)

CWE	Source	Description
CWE-1321	cna	CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.1	HIGH	4.0	cna	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

References (3)

https://github.com/n8n-io/n8n/security/advisories/GHSA-75qm-gp28-rcq9 https://github.com/n8n-io/n8n/security/advisories/GHSA-75qm-gp28-rcq9
https://github.com/n8n-io/n8n/releases/tag/n8n%402.27.4 https://github.com/n8n-io/n8n/releases/tag/n8n%402.27.4
https://github.com/n8n-io/n8n/releases/tag/n8n%402.28.1 https://github.com/n8n-io/n8n/releases/tag/n8n%402.28.1