CVE-2026-103252 n8n - Authorization Bypass

n8n < 1.123.80, 2.0.0 < 2.39.6, and 2.40.0 < 2.40.1 contain an authorization bypass caused by lack of caller access validation in the credential test endpoint, letting attackers exfiltrate sensitive variables by specifying arbitrary project IDs, exploit requires network access.

CVSS base score 7.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.27% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authorization Bypass
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-639

Vendor fix

Update to version 1.123.80, 2.39.6, 2.40.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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