Publish GHSA-vpgc-2f6g-7w7x

Author: advisory-database[bot]

advisories/github-reviewed/2026/03/GHSA-vpgc-2f6g-7w7x/GHSA-vpgc-2f6g-7w7x.json

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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-vpgc-2f6g-7w7x",
+  "modified": "2026-03-25T21:57:55Z",
+  "published": "2026-03-25T21:57:55Z",
+  "aliases": [
+    "CVE-2026-33720"
+  ],
+  "summary": "n8n Has Authorization Bypass in OAuth Callback via N8N_SKIP_AUTH_ON_OAUTH_CALLBACK",
+  "details": "## Impact\nWhen 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.\n\n- This issue only affects instances where `N8N_SKIP_AUTH_ON_OAUTH_CALLBACK=true` is explicitly configured (non-default).\n\n## Patches\nThe issue has been fixed in n8n version 2.8.0. Users should upgrade to this version or later to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Avoid enabling `N8N_SKIP_AUTH_ON_OAUTH_CALLBACK=true` unless strictly required.\n- Restrict access to the n8n instance to fully trusted users only.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N"
+    },
+    {
+      "type": "CVSS_V4",
+      "score": "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"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "npm",
+        "name": "n8n"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "2.8.0"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-vpgc-2f6g-7w7x"
+    },
+    {
+      "type": "ADVISORY",
+      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33720"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/n8n-io/n8n"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-863"
+    ],
+    "severity": "MODERATE",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-03-25T21:57:55Z",
+    "nvd_published_at": "2026-03-25T19:16:50Z"
+  }
+}