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TI-2026-82168 Aliases CVE-2026-118679GHSA-r9rf-g62g-xq7v

Server-side request forgery in n8n Slack Trigger leaks Slack tokens

Priority LOW 30CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

n8n before 1.123.83, from 2.0.0 before 2.41.4, and from 2.42.0 before 2.42.1 are affected. The Slack Trigger webhook contains a server-side request forgery flaw (CWE-918) that bypasses signature verification when no signing secret is set. An unauthenticated attacker who knows the webhook URL can name a file to download, which makes the node send the workspace access token to an attacker host.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00273 19th percentileScored 2026-11-07
Fix Fixed n8n (n8n-io): 1.123.83, 2.42.1, 2.41.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
n8nn8nbefore 1.123.831.123.83Patch availableCNA
n8nn8n2.42.0 to before 2.42.12.42.1Patch availableCNA
n8nn8n2.0.0 to before 2.41.42.41.4Patch availableCNA
  • n8n Vendorn8n Affected before 1.123.83 Fixed in 1.123.83 Patch available CNA
  • n8n Vendorn8n Affected 2.42.0 to before 2.42.1 Fixed in 2.42.1 Patch available CNA
  • n8n Vendorn8n Affected 2.0.0 to before 2.41.4 Fixed in 2.41.4 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*——n8n
  • cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:* Versions — — ·n8n

Remediation

Update n8n to 1.123.83 or later, to 2.41.4 or later, or to 2.42.1 or later, matching the release line in use.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA n8n (n8n-io) Fixed in 1.123.83
  • Fix · CNA n8n (n8n-io) Fixed in 2.42.1
  • Fix · CNA n8n (n8n-io) Fixed in 2.41.4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    n8n-io n8n 2.41.4, 2.42.1

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-82167 Prototype pollution in n8n workflow history compaction causes denial of servicePriority LOW 31
    • TI-2026-82166 n8n Local Gateway deep link silently re-pairs to attacker instancePriority LOW 26
    Show all 3 records →

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-118679
  2. 2026-10-28 Alias added: GHSA-r9rf-g62g-xq7v
  3. 2026-10-30 Priority changed: MEDIUM → LOW
  4. 2026-11-04 CISA SSVC decision points changed

References

Advisory 1

  • TI-2025-42131 n8n Vulnerable to Remote Code Execution via Expression Injection KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-17560 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling CVSS 3.1CRITICAL 10.0
  • TI-2026-01167 Authenticated users can bypass the Expression sandbox mechanism to achieve full remote… CVSS 3.1CRITICAL 9.9
  • TI-2026-00644 Sandbox escape in n8n Python task runner allows for arbitrary code execution on the underlying host. CVSS 3.1CRITICAL 9.9
  • TI-2026-82991 Code execution in n8n via deprecated Function nodes CVSS 4.0HIGH 8.7
  • TI-2025-35293 An arbitrary file upload vulnerability in the Chat Trigger component of N8N v1.95.3… CVSS 3.1HIGH 8.8
See all 233 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences