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.
Published: 2026-10-28
Score: 6.9 Medium
EPSS: n/a
KEV: No
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 28 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
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.
Title n8n before 1.123.83, 2.41.4, and 2.42.1 Slack Token Exfiltration via Slack Trigger
First Time appeared N8n
N8n n8n
Weaknesses CWE-918
CPEs cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*
Vendors & Products N8n
N8n n8n
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N'}

cvssV4_0

{'score': 6.9, 'vector': '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'}

Subscriptions

N8n N8n
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-28T18:59:51.136Z

Reserved: 2026-10-28T17:28:46.441Z

Link: CVE-2026-118679

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-28T19:17:34.120

Modified: 2026-10-28T19:17:34.250

Link: CVE-2026-118679

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-28T20:30:07Z

Weaknesses
  • CWE-918

    Server-Side Request Forgery (SSRF)