Vulnerability · Published Jul 9, 2026 · Assigned by GitHub_M

CVE-2026-59207n8n: "Allowed HTTP Request Domains" Restriction Bypass via AI Agents MCP Connector

High 7.1

In plain English

A high-severity security flaw 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 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.4%top 60.9% 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 2.27.4 and 2.28.1, the AI Agents feature did not enforce the Allowed HTTP Request Domains restriction configured on credentials when an MCP tool was pointed at an arbitrary URL, allowing a member-level user with use-only access to a shared credential to send its secret to an external server they control. This issue is fixed in versions 2.27.4 and 2.28.1.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n	2.28.1	GHSA-h44j-f5r5-ph73
npm	n8n	2.27.4	GHSA-h44j-f5r5-ph73

Affected products (as reported)

Vendor	Product	Versions
n8n-io	n8n	>= 2.28.0, < 2.28.1< 2.27.4

Weakness: CWE-693 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-h44j-f5r5-ph73 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