Vulnerability · Published Jul 9, 2026 · Assigned by GitHub_M

CVE-2026-59208n8n: Cross-Issuer Token Exchange Account Binding via Subject-Only Identity Resolution

High 7.6

In plain English

A high-severity improper authentication 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 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.6High

Exploit odds (30 days)0.3%top 81.5% 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 from 2.28.0 prior to 2.28.1, n8n instances configured with more than one trusted token-exchange issuer resolved external identities to local accounts using only the JWT sub claim and ignored the iss claim, allowing an attacker with a valid token from one trusted issuer and a sub matching a victim under another issuer to authenticate as that victim. 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-mq3m-f8x3-579w
npm	n8n	2.27.4	GHSA-mq3m-f8x3-579w

Affected products (as reported)

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

Weakness: CWE-287, CWE-346 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-mq3m-f8x3-579w 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