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TI-2026-74537 Aliases CVE-2026-110847

Stored cross-site scripting in n8n Chat Trigger customCss

Priority LOW 31CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

n8n before 1.123.83, from 2.0.0 before 2.41.4, and from 2.42.0 before 2.42.1 contains a stored cross-site scripting flaw in the Chat Trigger hosted-chat page. Insufficiently sanitised customCss values are inserted into the page as markup (CWE-79). A workflow author can publish a chat that requires no n8n user authentication, and its payload runs on the instance origin, acting on the sessions of signed-in visitors.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

n8n before 1.123.83, 2.x before 2.41.4, and 2.42.x before 2.42.1 contains a stored cross-site scripting vulnerability in the Chat Trigger hosted-chat page, where insufficiently sanitised customCss values are interpolated into the page as markup. Workflow authors can publish a chat without n8n user authentication whose payload executes on the instance origin, acting on the sessions of signed-in visitors.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00367 30th percentileScored 2026-11-07
Fix Fixed n8n (n8n-io): 1.123.83, 2.41.4, 2.42.1

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 1.123.83; 2.0.0 to before 2.41.4; 2.42.0 to before 2.42.11.123.83, 2.41.4, 2.42.1Patch availableCNA
  • n8n Vendorn8n Affected before 1.123.83; 2.0.0 to before 2.41.4; 2.42.0 to before 2.42.1 Fixed in 1.123.83, 2.41.4, 2.42.1 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

Upgrade n8n to 1.123.83, 2.41.4, or 2.42.1, depending on the release line in use.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

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

Fixed in the same release

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

  • Release ·

    n8n-io n8n 1.123.83, 2.41.4, 2.42.1

    5 records Highest priority Priority LOW 5 LOW

    Other records, highest priority first

    • TI-2026-74535 Code execution in n8n Git node Log operationPriority LOW 36
    • TI-2026-74539 n8n Stored XSS via Binary-Data File PreviewPriority LOW 33
    • TI-2026-74542 Authentication bypass in n8n allows unauthenticated workflow executionPriority LOW 28
    Show all 5 records →

Timeline

  1. 2026-10-15 Threatist record created from CVE-2026-110847
  2. 2026-10-15 CISA SSVC decision points changed
  3. 2026-10-15 Priority changed: MEDIUM → LOW

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