CVE-2026-86073 json
n8n: Per-Resource OAuth Consent Bypass via Unbound Refresh Token Resource Substitution
published 2mo ago modified 2mo ago also GHSA-cw9w-vv67-hf73 , EUVD-2026-73162
- cvss
- 7.6
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 33%
- public exploits
- 0
- none known
Summary
n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.1, the OAuth token endpoint bound an authorization code's first access token to the consented resource but did not bind its refresh token. Refreshing checked only that the requested resource was registered, not that it matched the original grant. An OAuth client approved for one workflow could substitute a different workflow URL in the resource parameter and obtain a valid token for an unapproved workflow accessible to the consenting user. This issue is fixed in versions 2.37.7 and 2.38.1.
Patch / fix
- npm n8n 2.37.7, 2.38.1
- n8n n8n 2.37.7
- github.com/n8n-io/n8n@1845848 commit
- github.com/n8n-io/n8n@380788f commit
- github.com/n8n-io/n8n#37122 pull request
- github.com/n8n-io/n8n#37588 pull request
- github.com/n8n-io/n8n/releases/tag/n8n@2.37.7 release
- github.com/n8n-io/n8n/releases/tag/n8n@2.38.1 release
Is CVE-2026-86073 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.9 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N |
| CNA | 4.0 | 5.9 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:L/VA:L/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 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | n8n | >=2.38.0, <2.38.1 <2.37.7 |
2.38.1 2.37.7 |
Affected products
- n8n-io n8n
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/n8n-io/n8n/pull/37122
web, issue-tracking
-
github.com
/n8n-io/n8n/pull/37588
web, issue-tracking
-
github.com
/n8n-io/n8n/commit/18458482861097a26f874f30ad7e8136e268475c
web, patch
-
github.com
/n8n-io/n8n/commit/380788fd9a3264c83161e868026a98731d274d88
web, patch
-
github.com
/n8n-io/n8n/security/advisories/GHSA-cw9w-vv67-hf73
web, mitigation, vendor-advisory
-
github.com
/n8n-io/n8n/releases/tag/n8n@2.37.7
web, release-notes
-
github.com
/n8n-io/n8n/releases/tag/n8n@2.38.1
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-86073
advisory
-
github.com
/n8n-io/n8n
package
Sources
- CVE List CVE-2026-86073
- GitHub Advisory GHSA-cw9w-vv67-hf73
- NVD CVE-2026-86073
Fencer Intel 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.