Summary
generated automatically from NVD datan8n's Slack Trigger webhook has a server-side request forgery flaw (CWE-918) that applies when no signing secret is configured, because signature verification can then be bypassed. An unauthenticated attacker who knows the webhook URL can specify a file to download, which makes the node send the workspace's Slack access token to an attacker-controlled host and return the response. The description names n8n versions before 1.123.83, 2.41.4 and 2.42.1, and the flaw is rated 7.5 (HIGH, CVSS v3.1).
NVD 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.
EPSS · FIRST.org
0.27%probability of exploitation in the next 30 days
Higher than 19% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-30, recomputed daily by FIRST.org.
CVSS v3.1 Score
Information
- Published
- 28 oct. 2026
- Updated
- 28 oct. 2026
- Status
- Deferred
- Source
- disclosure@vulncheck.com
Weaknesses (CWE)
Similar CVEs
Other vulnerabilities of type CWE-918
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