AI agent vulnerability · n8n

CVE-2026-86994: n8n: Cross-User Active Workflow ID and Lifecycle Event Disclosure via Missing userId Filter

mediumCVSS 4.0 5.3GHSA-65xw-2v52-jhxc

Impact The endpoint /rest/active-workflows returned every active workflow ID on the instance to any member, regardless of sharing, and workflow activation, deactivation and publication push events were broadcast to every connected client, carrying workflow IDs, version IDs and activation-error detail across users.

Published Sep 10, 2026

Affected packages

n8n

Ecosystem: npm
Affected: < 1.123.76
Fixed in: 1.123.76
Check: npm ls n8n

n8n

Ecosystem: npm
Affected: >= 2.38.0, < 2.38.2
Fixed in: 2.38.2
Check: npm ls n8n

n8n

Ecosystem: npm
Affected: >= 2.0.0, < 2.37.7
Fixed in: 2.37.7
Check: npm ls n8n

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Impact

The endpoint /rest/active-workflows returned every active workflow ID on the instance to any member, regardless of sharing, and workflow activation, deactivation and publication push events were broadcast to every connected client, carrying workflow IDs, version IDs and activation-error detail across users. The patch scopes both the listing and the push events through the sharing service, so a user only sees workflows they can access.

Patches

The issue has been fixed in n8n versions 1.123.76, 2.37.7, and 2.38.2. Users should upgrade to one of these versions or later to remediate the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators should consider the following temporary mitigations:

Restrict n8n instance access to fully trusted users only.
Avoid provisioning global:member accounts for untrusted users until the instance is patched.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Credited to tr4ce-ju.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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