CVE-2026-118679

n8n before 1.123.83, 2.41.4, and 2.42.1 Slack Token Exfiltration via Slack Trigger

State: Published
Severity: 6.9 Medium
Published: Oct 28, 2026
Updated: Oct 28, 2026
Reserved: Oct 28, 2026

Description

n8n before 1.123.83, 2.41.4, and 2.42.1 contains a server-side request forgery vulnerability in the Slack Trigger webhook that allows unauthenticated attackers to exfiltrate Slack tokens by bypassing signature verification when no signing secret is set. Attackers who know the webhook URL can name a file to download, causing the node to send the workspace access token to an attacker host and return the response.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:L/SA:N	VulnCheck
3.1	7.5 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N	VulnCheck

Weaknesses

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
n8nn8n-io	before 1.123.83Affected 1.123.83Not affected
n8nn8n-io	2.42.0 to before 2.42.1Affected 2.42.1Not affected
n8nn8n-io	2.0.0 to before 2.41.4Affected 2.41.4Not affected

References

GitHub Security Advisory (GHSA-3c3p-5959-3ghr)vendor-advisory
VulnCheck Advisory: n8n before 1.123.83, 2.41.4, and 2.42.1 Slack Token Exfiltration via Slack Triggerthird-party-advisory

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