Vulnerability · Published May 4, 2026 · Assigned by GitHub_M

CVE-2026-42227n8n: Public API Variables IDOR Allows Cross-Project Secret Disclosure

Medium 6.0

In plain English

A medium-severity authorization bypass via user-controlled key 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 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.0Medium

Exploit odds (30 days)0.2%top 89.7% 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 versions 1.123.32, 2.17.4, and 2.18.1, an authenticated user with a valid API key scoped to variable:list could read variables from projects they are not a member of by supplying an arbitrary projectId query parameter to the public API variables endpoint. The handler queried the variables repository directly without enforcing project membership checks, bypassing the authorization-aware service layer used by the internal enterprise controller. If variables were misused to store sensitive information such as credentials or tokens, they should be rotated immediately. This issue only affects licensed enterprise or team deployments with multiple projects and the variables feature enabled. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n	2.18.1	GHSA-756q-gq9h-fp22
npm	n8n	1.123.32	GHSA-756q-gq9h-fp22
npm	n8n	2.17.4	GHSA-756q-gq9h-fp22

Affected products (as reported)

Vendor	Product	Versions
n8n-io	n8n	< 1.123.32>= 2.17.0, < 2.17.4>= 2.18.0, < 2.18.1

Weakness: CWE-639 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-756q-gq9h-fp22 x_refsource_CONFIRM