CVE-2026-103256

n8n before 2.39.6 and 2.40.x before 2.40.1 Credentials Leak via preAuthentication Hook

State: Published
Severity: 7.1 High
Published: Oct 1, 2026
Updated: Oct 1, 2026
Reserved: Sep 30, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/SA:N	VulnCheck
3.1	7.1 High	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N	VulnCheck

Weaknesses

CWE-522 Insufficiently Protected Credentials

Affected Products

Product	Versions
n8nn8n-io	before 2.39.6Affected 2.40.0 to before 2.40.1Affected

References

GitHub Security Advisory (GHSA-gx6g-2hm7-c4xf)vendor-advisory
VulnCheck Advisory: n8n before 2.39.6 and 2.40.x before 2.40.1 Credentials Leak via preAuthentication Hookthird-party-advisory

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