PT-2026-36902 · N8N · N8N

Ori-Ron · Published 2026-04-22 · Updated 2026-05-06 · CVE-2026-42230

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions n8n versions prior to 1.123.32 n8n versions prior to 2.17.4 n8n versions prior to 2.18.1

Description The '/mcp-oauth/register' endpoint allows OAuth client registrations without authentication, which permits the registration of arbitrary redirect uri values. When a user denies the MCP OAuth consent dialog, the handleDeny() handler redirects the user to the registered redirect uri without validation. This creates an open redirect, allowing an attacker to use a phishing link to silently redirect a victim to an external, attacker-controlled site if the victim clicks "Deny" on the consent page.

Recommendations Update to version 1.123.32. Update to version 2.17.4. Update to version 2.18.1.

Fix

Open Redirect

Weakness Enumeration

CWE-601

Related Identifiers

BDU:2026-06983

CVE-2026-42230

GHSA-F6X8-65Q6-J9M9

Affected Products

N8N

References · 10

• https://github.com/n8n-io/n8n/security/advisories/GHSA-f6x8-65q6-j9m9 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42230 · Security Note
• https://osv.dev/vulnerability/GHSA-f6x8-65q6-j9m9 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06983 · Security Note
• https://github.com/n8n-io/n8n · Note
• https://t.me/cveNotify/162370 · Telegram Post
• https://twitter.com/infoflowcloud/status/2051385372572069977 · Twitter Post
• https://twitter.com/CVEnew/status/2051383975243850210 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2051536766021046410 · Twitter Post
• https://t.me/cveNotify/162079 · Telegram Post