CVE-2026-45732: n8n Has a Cross-user Authorization Bypass in Dynamic Credential OAuth Endpoints

The OAuth1 and OAuth2 credential reconnect endpoints authorized access using credential:read rather than credential:update. An authenticated user with read-only access to a shared credential could initiate an OAuth reconnect flow and overwrite the stored token material for that credential with tokens bound to an external account they control. Workflows relying on the affected credential would subsequently execute under the attacker’s OAuth identity, enabling data exfiltration to attacker-controlled external services and persistent takeover of shared integrations.

This issue affects instances where credentials are shared with other users or across projects.