CVE-2026-59208
published 2026-07-09CVE-2026-59208: 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…
PriorityP346medium6.8CVSS 3.1
AVNACHPRLUINSUCHIHAN
EPSS
3.13%
87.3th percentile
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
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| n8n-io | n8n | < 2.27.4 | 2.27.4 |
| n8n-io | n8n | — | — |
| n8n | n8n | < 2.27.4 | 2.27.4 |
| n8n | n8n | — | — |
| n8n | n8n | >= 0 < 2.27.4 | 2.27.4 |
| n8n | n8n | >= 2.28.0 < 2.28.1 | 2.28.1 |
CVSS provenance
nvdv3.16.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
nvdv4.07.6HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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n8n Token Exchange Flaw Could Let Attackers Log In as Users From Another Issuer
blogs_hackernews·2026-07-16·CVSS 9.9
CVE-2026-59208 [CRITICAL] n8n Token Exchange Flaw Could Let Attackers Log In as Users From Another Issuer
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## n8n Token Exchange Flaw Could Let Attackers Log In as Users From Another Issuer
sub
iss
sub
CVE-2026-59208
Strix says it pointed out that the agent at the token-exchange flow and found the identity-binding bug there.
## Two issuers, one account
Token exchange is n8n's Enterprise route for OEM partners who embed the product , an RFC 8693 implementation that spares their users a second login screen.
N8N_TOKEN_EXCHANGE_TRUSTED_KEYS
sub
iss
sub
n8n keyed on half of it. Nothing stops two issuers from emitting the same subject string, and when they do, both land on one n8n account.
## How big a deal is this
The fla
2026-07-09
Published