NPM: n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook

NPM: n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook vulnerability discovered by ? in WordPress Npm n8n versions 2.27.4...

GHSA-Q5XF-XHWF-CWQF n8n: Member-Level Users Can Execute Other Users' MCP Server Trigger Workflows via Missing OAuth Authorization Check

Impact The OAuth 2.1 consent and token-issuance flow introduced in n8n 2.27.0 does not verify that the authenticated user has access to the workflow referenced as the OAuth resource. A member-level user can register an OAuth client, self-approve consent for another user's n8n OAuth2-protected MCP...

n8n: Expression sandbox escape via arrow-function bodies enabling command execution

Impact An authenticated user with permission to create or modify workflows could abuse crafted expressions using arrow functions to bypass the expression sandbox, triggering unintended system command execution on the host running n8n. Patches The issue has been fixed in n8n versions 2.31.5 and...

GHSA-64XH-79J6-R5V8 n8n: Bypass "Allowed HTTP Request Domains" Credential Restriction in Multiple AI and LLM Nodes

Impact The credential "Allowed HTTP Request Domains" allowlist was intended to restrict which hosts a credential's secret could be sent to, protecting shared credentials from users who could use but not view them. Several AI/LLM nodes did not enforce this allowlist when a user-supplied base or...

n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution

Impact The legacy expression evaluator's computed-member sanitizer can be bypassed by an authenticated user with workflow create or modify permissions. Successful exploitation grants the attacker host-level code execution as the n8n process. The legacy expression engine is the default engine in...

n8n: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Preview

Impact The HTML preview renders execution output into an iframe srcdoc without sandbox, so a sanitizer bypass lets injected script run same-origin as the editor. When a victim opens the preview, it can call authenticated APIs with their session. An account with global:member privileges can exploi...

GHSA-W46P-W7W2-FR9G Duplicate Advisory: AI Agents Project Viewer Privilege Escalation via run_node_tool

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-x5vx-c2c8-m3w9. This link is maintained to preserve external references. Original Description n8n versions before 2.30.1 contain a privilege escalation vulnerability in the AI Agents feature where the...

GHSA-38FJ-36M5-783C Duplicate Advisory: Authenticated SSRF via Dynamic Node Parameters Endpoints Allows Internal Network Access

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-9w78-79q7-r4fp. This link is maintained to preserve external references. Original Description n8n versions before 1.123.64 contain a server-side request forgery vulnerability in the dynamic-node-parameters...

CVE-2026-65599 n8n before 1.123.64, 2.29.8, and 2.30.1 Credential Exposure via JWT Header

n8n versions before 1.123.64, 2.29.8, and 2.30.1 contain a credential exposure vulnerability: when configured with a Google Service Account key, the full PEM private key was mistakenly placed in the JWT header's kid field intended only for a key identifier. Because JWT headers are Base64-encoded...

EUVD-2026-47630

n8n before 2.28.0 and before 2.27.4 on the 2.27.x branch registers the DELETE /$restEndpoint/test-webhook/:id endpoint before authentication middleware is applied, allowing any unauthenticated network caller who knows a workflow ID to cancel that workflow's active test webhook registration. The...

PT-2026-63357

n8n versions before 1.123.64, 2.29.8, and 2.30.1 contain a credential exposure vulnerability: when configured with a Google Service Account key, the full PEM private key was mistakenly placed in the JWT header's kid field intended only for a key identifier. Because JWT headers are Base64-encoded...

EUVD-2026-44624

n8n before version 2.10.0 contains an input validation vulnerability in the Guardrail node that allows attackers to bypass default guardrail instructions. End users can craft malicious inputs to circumvent guardrail protections and compromise workflow integrity...

GHSA-2VWW-6P9H-5G8J Duplicate Advisory: Authenticated Users Can Exhaust Temporary Disk Storage via Data-Table File Uploads

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-w867-jm58-p9pv. This link is maintained to preserve external references. Original Description n8n before 2.28.0 and before 1.123.58 on the 1.x branch contains a disk space exhaustion vulnerability in the...

CVE-2026-58661

n8n before 2.28.0 and before 1.123.58 on the 1.x branch contains a disk space exhaustion vulnerability in the data-table file upload endpoint. The per-request quota check does not account for files already written to the shared temporary directory, allowing an authenticated user to repeatedly...

CVE-2026-59208

n8n is an open source workflow automation platform. Prior to 2.27.4 and from 2.28.0 prior to 2.28.1, n8n instances configured with more than one trusted token-exchange issuer resolved external identities to local accounts using only the JWT sub claim and ignored the iss claim, allowing an attacke...

CVE-2026-59209 n8n: Shared Credential Header Leak via HTTP Request Pagination Expression

n8n is an open source workflow automation platform. Prior to 1.123.61, 2.27.4, and, 2.28.1, an authenticated member with use-only editor access to a shared workflow could read credential-populated headers exposed via the $request object inside an HTTP Request node's pagination expression and...

CVE-2026-56360

n8n before versions 1.123.18 and 2.6.2 fails to verify HMAC-SHA256 signatures on Zendesk webhooks in the ZendeskTrigger node. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary malicious data...

EUVD-2026-42264

n8n before 2.25.7 and 2.26.x before 2.26.2 contains an authorization bypass in the Public API execution retry endpoint, which authorizes access using the workflow:read scope instead of workflow:execute. An authenticated user with read-only access to a shared workflow can use the Public API to ret...

CVE-2026-56776 n8n - Incorrect OAuth Scope Validation in Workflow Test Run Endpoint

n8n before 1.123.55, 2.25.7, and 2.26.2 contains an authorization bypass in the POST /workflows/workflowId/test-runs/new endpoint, which authorizes access using the workflow:read scope instead of workflow:execute. An authenticated user with read-only access to a workflow can trigger a real...

EUVD-2026-42257

n8n before 2.8.0 contains a cross-site scripting vulnerability in the credential management flow where authenticated users can inject malicious JavaScript URLs into OAuth2 credential Authorization URL fields. Attackers can craft malicious credentials and trick victims into clicking the OAuth...