CVE-2026-59208

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

State: Published
Severity: 7.6 High
Published: Jul 9, 2026
Updated: Jul 14, 2026
Reserved: Jul 2, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.6 High	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	GitHub_M

Weaknesses

CWE-287 Improper Authentication
CWE-346 Origin Validation Error

Affected Products

Product	Versions
n8nn8n-io	>= 2.28.0, < 2.28.1Affected < 2.27.4Affected

References

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