n8n: Instance AI Credential Setup Accepts Unvalidated Probe URL from Fetched Content
n8n
- Severity
- High, CVSS 7.1
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
- Record
- CVE-2026-86074
- Affects
- n8n
- Known exploited
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Published
- Record first published by the source
- September 8, 2026
- Source last modified
- September 11, 2026
Description
n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the Instance AI credential setup flow accepted a credential test or verification URL without checking that it matched the workflow node's origin. Attacker-controlled fetched content could influence that URL after a user injected it into the setup flow, causing authenticated requests, redirects, or probes to reach another origin. The affected logic includes packages/@n8n/instance-ai/src/tools/workflows/credential-utils.ts and the extractServiceOrigin origin derivation. This issue is fixed in versions 2.37.7 and 2.38.2.
Description quoted from the NVD record.
Who is affected
This flaw affects n8n, a tool for automating tasks by connecting different apps and online services. It affects versions before 2.37.7 and 2.38.2, in the part where the built-in AI assistant helps you set up the saved logins (credentials) that workflows use. When testing a login, this part did not check that the test address belonged to the right service. If a user brought content controlled by an attacker into that setup, the attacker could change the address, so requests carrying your login, redirects or checks could reach a different website. This flaw is rated High.
What to do
- The person who installed or runs n8n for your organization should handle this update.
- If an IT provider or vendor runs n8n for you, send them this advisory and ask when the update will be done.
- Update n8n to version
2.37.7or2.38.2, or any later release, since these versions fix this flaw. - Check the vendor advisory linked on this page to see which of these fixed versions matches the version line your installation uses.
Analysis written from the source record as of September 11, 2026 and reviewed before publishing.