Vulnerability · Published Jul 9, 2026 · Assigned by GitHub_M

CVE-2026-59206n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration

High 7.1

In plain English

A high-severity prototype pollution in n8n from n8n-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.7%top 48.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n	1.123.61	GHSA-75qm-gp28-rcq9
npm	n8n	2.28.1	GHSA-75qm-gp28-rcq9
npm	n8n	2.27.4	GHSA-75qm-gp28-rcq9

Affected products (as reported)

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

Weakness: CWE-1321 · Vector: 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

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