CVE-2026-33720— n8n Has Authorization Bypass in OAuth Callback via N8N_SKIP_AUTH_ON_OAUTH_CALLBACK
Quick assessment
Affected
n8n-io n8n
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
n8n是n8n开源的一个可扩展的工作流自动化工具。 n8n 2.8.0之前版本存在安全漏洞，该漏洞源于OAuth回调处理程序跳过状态参数所有权验证，可能导致OAuth令牌被盗。
Possible ATT&CK Techniques 3 AI
T1110 · Brute Force T1078 · Valid Accounts T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-33720
Vulnerability Information
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Vulnerability Title
n8n Has Authorization Bypass in OAuth Callback via N8N_SKIP_AUTH_ON_OAUTH_CALLBACK
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
n8n是n8n开源的一个可扩展的工作流自动化工具。 n8n 2.8.0之前版本存在安全漏洞，该漏洞源于OAuth回调处理程序跳过状态参数所有权验证，可能导致OAuth令牌被盗。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-33720
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-33720 (1)
Same Patch Batch · n8n-io · 2026-03-25 · 11 CVEs total
| CVE-2026-27496 | n8n has In-Process Memory Disclosure in its Task Runner | |
| CVE-2026-33660 | n8n Has Multiple Remote Code Execution Vulnerabilities in Merge Node AlaSQL SQL Mode | |
| CVE-2026-33663 | n8n Vulnerable to Credential Theft via Name-Based Resolution and Permission Checker Bypass | |
| CVE-2026-33665 | n8n: LDAP Email-Based Account Linking Allows Privilege Escalation and Account Takeover | |
| CVE-2026-33696 | n8n Vulnerable to Prototype Pollution in XML & GSuiteAdmin node parameters lead to RCE | |
| CVE-2026-33713 | n8n Vulnerable to SQL Injection in Data Table Node via orderByColumn Expression | |
| CVE-2026-33722 | n8n Has External Secrets Authorization Bypass in Credential Saving | |
| CVE-2026-33724 | n8n's Source Control SSH Configuration Uses StrictHostKeyChecking=no | |
| CVE-2026-33749 | n8n Vulnerable to XSS via Binary Data Inline HTML Rendering | |
| CVE-2026-33751 | n8n Vulnerable to LDAP Filter Injection in LDAP Node |
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V. Comments for CVE-2026-33720
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