CVE-2026-103256
n8n before 2.39.6 and 2.40.x before 2.40.1 Credentials Leak via preAuthentication Hook
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
0th
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain a credentials leak vulnerability in the Wekan and Baserow username-and-password credentials that sends unencrypted passwords to unvalidated hosts. Attackers with credential update permissions can modify the host field to receive account passwords at arbitrary hosts, bypassing domain validation controls.
| CWE | CWE-522 |
| Vendor | n8n-io |
| Product | n8n |
| Published | Oct 1, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
n8n-io / n8n
0 < 2.39.6 2.40.0 < 2.40.1
References
Credits
🔍 nlgbao1340