PT-2026-56817 · N8N+1 · N8N

Published 2026-07-09 · Updated 2026-07-09 · CVE-2026-59208

NVD

CVSS v3.1

6.8

Medium

Base vector

AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

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.

Fix

Improper Authentication

Origin Validation Error

Weakness Enumeration

CWE-287

CWE-346

Related Identifiers

CVE-2026-59208

Affected Products

N8N

References · 4

• https://github.com/n8n-io/n8n/security/advisories/GHSA-mq3m-f8x3-579w · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-59208 · Security Note
• https://github.com/n8n-io/n8n/releases/tag/n8n%402.28.1 · Note
• https://github.com/n8n-io/n8n/releases/tag/n8n%402.27.4 · Note