| Component | n8n |
| Severity | high (CVSS 8.8) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Published (NVD) | 2026-08-20 |
| Last modified | 2026-09-01 |
| Affected versions | n8n < 2.33.4 n8n = 2.34.0 |
| Fixed in | 2.33.4 |
| Weakness | CWE-639 |
| CISA KEV | not listed |
NVD description
n8n before 2.34.1 and 2.33.4 contains an authorization bypass in the custom project role deletion (reassignment) path. When deleting a custom project role with a reassignment target, the code validated only that the target role existed and was project-scoped, performing no project-level authorization check. A user holding only the narrow role:manageProject global scope could delete any custom project role in use on the instance and reassign its holders (including themselves) to the built-in project:admin role, gaining full administrative control of projects they had no legitimate access to.
What to do
- Upgrade n8n to
2.33.4or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-77079
- https://github.com/n8n-io/n8n/security/advisories/GHSA-xhmh-8fgr-xqhj
- https://www.vulncheck.com/advisories/n8n-before-authorization-bypass-via-custom-role-deletion
Read more
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