Description
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain a session token leakage vulnerability in the Dynamic Credentials authorize and revoke endpoints. Attackers with resolver registration capability can capture collaborators' session tokens by setting a fallback resolver to an attacker-controlled endpoint during the account connection flow, enabling unauthorized credential access.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| n8n-io | n8n | < 2.39.6, 2.40.0 – < 2.40.1 | 2.39.6 |
Advisories 1
- WID-SEC-2026-3393 n8n: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 1, 2026
References
- GitHub Security Advisory (GHSA-rx55-8qhx-4hwx) vendor-advisory
- VulnCheck Advisory: n8n before 2.39.6 and 2.40.x before 2.40.1 Session Token Leak via Dynamic Credentials third-party-advisory