CVE-2026-103259 n8n - Authentication Bypass

n8n < 2.39.6 and 2.40.0 < 2.40.1 contain a session token leakage caused by fallback resolver manipulation in Dynamic Credentials authorize and revoke endpoints, letting attackers with resolver registration capture collaborators' session tokens, exploit requires resolver registration capability.

CVSS base score 7.6 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.24% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-863

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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