CVE-2026-56358
5.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Summary
n8n before 1.123.25 (1.x) and before 2.11.2 (2.x), with the fix also included in 2.12.0, contains a stored cross-site scripting vulnerability in the Form Trigger node's CSS sanitization that allows authenticated users to inject malicious scripts. Attackers with workflow creation permissions can inject XSS payloads that execute persistently for all form visitors, enabling form hijacking and phishing attacks.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| n8n | n8n | 0 < 1.123.25 | affected |
| n8n | n8n | 1.123.25 | unaffected |
| n8n | n8n | 2.0.0-rc.0 < 2.11.2 | affected |
| n8n | n8n | 2.11.2 | unaffected |
| n8n | n8n | 0 < 2.11.2 | affected |
| n8n | n8n | 2.11.2 | unaffected |
| n8n | n8n | 0 < 1.123.25 | affected |
| n8n | n8n | 1.123.25 | unaffected |
Weaknesses
- CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-q4fm-pjq6-m63g
- https://www.vulncheck.com/advisories/n8n-stored-cross-site-scripting-in-form-trigger-node
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