Medium severity · published Jul 9, 2026
CVE-2026-59208
n8n: Cross-Issuer Token Exchange Account Binding via Subject-Only Identity Resolution
6.8
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N8
n8n · n8n-io
>= 2.28.0, < 2.28.1; < 2.27.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59208
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59208
Release Notes
https://github.com/n8n-io/n8n/releases/tag/n8n%402.27.4
Release Notes
https://github.com/n8n-io/n8n/releases/tag/n8n%402.28.1
Vendor Advisory
https://github.com/n8n-io/n8n/security/advisories/GHSA-mq3m-f8x3-579w
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