CVE-2026-59208 json
n8n: Cross-Issuer Token Exchange Account Binding via Subject-Only Identity Resolution
published 2026-07-09 4 mo ago modified 2026-10-25 14 d ago also GHSA-mq3m-f8x3-579w , EUVD-2026-42610
- cvss
- 6.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 18%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm n8n 2.27.4, 2.28.1
- n8n n8n 2.27.4
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 3 mo ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.6 | 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 |
| CNA | 4.0 | 7.6 | 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/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 |
| NVD | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | n8n | >=2.28.0, <2.28.1 <2.27.4 |
2.28.1 2.27.4 |
Affected products
- n8n-io n8n
Classification
References
-
github.com
/n8n-io/n8n/security/advisories/GHSA-mq3m-f8x3-579w
web, vendor-advisory
-
github.com
/n8n-io/n8n/releases/tag/n8n%402.27.4
release-notes
-
github.com
/n8n-io/n8n/releases/tag/n8n%402.28.1
release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-59208
advisory
-
github.com
/n8n-io/n8n
package
-
github.com
/n8n-io/n8n/releases/tag/n8n@2.27.4
web
-
github.com
/n8n-io/n8n/releases/tag/n8n@2.28.1
web
Sources
- CVE List CVE-2026-59208
- GitHub Advisory GHSA-mq3m-f8x3-579w
- NVD CVE-2026-59208
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.