CVE-2026-118679 n8n - Server Side Request Forgery

n8n < 1.123.83, 2.41.4, and 2.42.1 contains a server-side request forgery caused by bypassing signature verification in Slack Trigger webhook when no signing secret is set, letting unauthenticated attackers exfiltrate Slack tokens by naming a file to download.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Server Side Request Forgery
Impact
Information Disclosure, Server Side Request Forgery
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
Published
28 October 2026
Updated
29 October 2026
Weakness
CWE-918

Vendor fix

Update to version 1.123.83, 2.41.4, 2.42.1 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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