CVE-2026-42230
Medium · 6.1CVSS
6.1
EPSS
0.3%
Published
May 4, 2026
CISA due date
—
The record
n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, the /mcp-oauth/register endpoint accepted OAuth client registrations without authentication, allowing arbitrary redirect_uri values to be registered. When a user denies the MCP OAuth consent dialog, the handleDeny handler redirects the user to the registered redirect_uri without validation, enabling an open redirect to an attacker-controlled URL. An attacker can craft a phishing link and send it to a victim; if the victim clicks "Deny" on the consent page, they are silently redirected to an external site. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | n8n | 0 | 1.123.32 |
| npm | n8n | 2.0.0 | 2.17.4 |
| npm | n8n | 2.18.0 | 2.18.1 |
Related vulnerabilities
- GHSA-f6x8-65q6-j9m9 n8n has Open Redirect in MCP OAuth Consent Flow Same vulnerability
- CVE-2026-54308 n8n is an open source workflow automation platform. Also affects n8n
- CVE-2026-54307 n8n is an open source workflow automation platform. Also affects n8n
- CVE-2026-54304 n8n is an open source workflow automation platform. Also affects n8n
- CVE-2026-54305 n8n is an open source workflow automation platform. Also affects n8n
- CVE-2026-54306 n8n is an open source workflow automation platform. Also affects n8n
- CVE-2026-54302 n8n is an open source workflow automation platform. Also affects n8n
- CVE-2026-54301 n8n is an open source workflow automation platform. Also affects n8n