Auth bypass in N8n
CVE-2026-56778
n8n before 2.25.7 and 2.26.x before 2.26.2 contains an authorization bypass in the Public API execution retry endpoint, which authorizes access using the workflow:read scope instead of workflow:execute. An authenticated user with read-only access to a shared workflow can use the Public API to retry executions of that workflow, bypassing the intended permission boundary between read and execute access. This affects instances where workflows are shared with other users or across projects.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- N8n — versions 0, 2.26.2, 2.25.7
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-h3jj-5f3v-3685 (vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/n8n-authorization-bypass-in-public-api-execution-r… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-56778?
- CVE-2026-56778 is a medium-severity vulnerability in N8n, classified under Incorrect Authorization. CVSS score: 6.4/10. Published 2026-07-08.
- How severe is CVE-2026-56778?
- Medium severity. CVSS v3 base score is 6.4 out of 10.