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Advisories

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

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Severity
medium
Date
Affecting

  • n8n >= 0, < 1.123.83

  • n8n >= 2.42.0, < 2.42.1

  • n8n >= 2.0.0, < 2.41.4

CWE
  • CWE-918 Server-Side Request Forgery (SSRF)
CVSS
6.9
CVSS V4 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
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.

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