| Component | n8n |
| Severity | high (CVSS 7.6) |
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H |
| Published (NVD) | 2026-10-01 |
| Affected versions | < 2.39.6 read from the advisory text: NVD has not published CPE data yet |
| Fixed in | 2.39.6 |
| Weakness | CWE-863 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade n8n to
2.39.6or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-103259
- https://github.com/n8n-io/n8n/security/advisories/GHSA-rx55-8qhx-4hwx
- https://www.vulncheck.com/advisories/n8n-before-2.39.6-and-2.40-x-before-2.40.1-session-token-leak-via-dynamic-credentials
Read more
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