CVE-2026-103246 n8n - Broken Access Control

n8n < 2.39.6 and 2.40.0 < 2.40.1 contain an information disclosure vulnerability caused by failure to validate credential ownership during inline agent node-tool introspection, letting attackers decrypt and exfiltrate plaintext secrets without ownership verification.

CVSS base score 7.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.26% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
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

Upgrade to versions 2.39.6 or 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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