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.
Fix
Patch, vendor advisory and mitigation references on NVD 1
- https://github.com/n8n-io/n8n/security/advisories/GHSA-xhmh-8fgr-xqhj Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.4 · n8nNVD modified 2026-10-23 23:10
Affected (CPE criteria) 2
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*cpe:2.3:a:n8n:n8n:2.34.0:*:*:*:*:node.js:*:*
References 2
- https://github.com/n8n-io/n8n/security/advisories/GHSA-xhmh-8fgr-xqhj Mitigation, Vendor Advisory
- https://www.vulncheck.com/advisories/n8n-before-authorization-bypass-via-custom-role-deletion Third Party Advisory