CVE-2026-56775 json
n8n - Incorrect OAuth Scope Validation in Evaluation Test Runs Endpoints
published 2026-06-17 4 mo ago modified 2026-10-29 10 d ago also GHSA-664h-gpgq-h6xx , EUVD-2026-42262
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 23%
- public exploits
- 0
- none known
Summary
n8n before 1.123.55, 2.25.7, and 2.26.2 contains an authorization vulnerability in three mutating evaluation test-run endpoints that authorize state-changing actions using the workflow:read scope instead of the action-appropriate workflow:execute scope. On instances using Advanced Permissions (Enterprise/Cloud) with projects and viewer roles, an authenticated user with the project:viewer role can start new evaluation test runs, cancel in-flight runs, and delete run records for workflows they only have read access to.
Patch / fix
- npm n8n 1.123.55, 2.25.7, 2.26.2
- n8n n8n 1.123.55, 2.25.7, 2.26.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N |
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
| CNA | 4.0 | 5.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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 |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | n8n | <1.123.55 >=2.26.0, <2.26.2 >=2.0.0-rc.0, <2.25.7 |
1.123.55 2.26.2 2.25.7 |
Affected products
- n8n n8n
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/n8n-io/n8n/security/advisories/GHSA-664h-gpgq-h6xx
vendor-advisory, web, mitigation
-
vulncheck.com
/advisories/n8n-incorrect-oauth-scope-validation-in-evaluation-test-runs-endpoints
third-party-advisory
-
github.com
/n8n-io/n8n
package
Sources
- CVE List CVE-2026-56775
- GitHub Advisory GHSA-664h-gpgq-h6xx
- NVD CVE-2026-56775
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