CVE-2026-118679 n8n before 1.123.83, 2.41.4, and 2.42.1 Slack Token Exfiltration via Slack Trigger

Medium 6.9 Published 28 Oct 2026 Updated 28 Oct 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-118679?

CVE-2026-118679 is a medium-severity vulnerability in n8n-io n8n, published on 28 Oct 2026.

Official 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.

Weakness: CWE-918

Which versions are affected by CVE-2026-118679?

How do I fix CVE-2026-118679?

No fix has been published for CVE-2026-118679 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-118679 being exploited?

There is no known exploitation of CVE-2026-118679 in the wild and no public exploit code.

Sources

Also known as GHSA-3c3p-5959-3ghr, GHSA-r9rf-g62g-xq7v.