CVE-2026-33720

The record

n8n is an open source workflow automation platform. Prior to version 2.8.0, when the `N8N_SKIP_AUTH_ON_OAUTH_CALLBACK` environment variable is set to `true`, the OAuth callback handler skips ownership verification of the OAuth state parameter. This allows an attacker to trick a victim into completing an OAuth flow against a credential object the attacker controls, causing the victim's OAuth tokens to be stored in the attacker's credential. The attacker can then use those tokens to execute workflows in their name. This issue only affects instances where `N8N_SKIP_AUTH_ON_OAUTH_CALLBACK=true` is explicitly configured (non-default). The issue has been fixed in n8n version 2.8.0. Users should upgrade to this version or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations: Avoid enabling `N8N_SKIP_AUTH_ON_OAUTH_CALLBACK=true` unless strictly required, and/ or restrict access to the n8n instance to fully trusted users only. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Affected packages

Related vulnerabilities

• GHSA-vpgc-2f6g-7w7x n8n Has Authorization Bypass in OAuth Callback via N8N_SKIP_AUTH_ON_OAUTH_CALLBACK 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