CVE-2026-56776
n8n - Incorrect OAuth Scope Validation in Workflow Test Run Endpoint
Description
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 evaluation test run, causing the workflow to execute via the internal workflow runner and resulting in unintended outbound API calls, data mutations, or other side effects in connected downstream systems. The issue primarily affects instances using the Evaluations feature where RBAC project roles grant workflow:read without workflow:execute.
INFO
Published Date :
July 8, 2026, 2:17 p.m.
Last Modified :
July 8, 2026, 3:05 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-56776
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update n8n to version 1.123.55 or later.
- Restrict workflow:execute scope for read-only users.
- Review RBAC project roles carefully.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-56776.
| URL | Resource |
|---|---|
| https://github.com/n8n-io/n8n/security/advisories/GHSA-hv7x-3x78-gx53 | |
| https://www.vulncheck.com/advisories/n8n-incorrect-oauth-scope-validation-in-workflow-test-run-endpoint |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-56776 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-56776
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-56776 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-56776 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'n8n', 'product': 'n8n', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '1.123.55', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '1.123.55', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/n8n', 'defaultStatus': 'unaffected'}, {'vendor': 'n8n', 'product': 'n8n', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.26.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '2.26.2', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/n8n', 'defaultStatus': 'unaffected'}, {'vendor': 'n8n', 'product': 'n8n', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.25.7', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '2.25.7', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/n8n', 'defaultStatus': 'unaffected'}] Added Description 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 evaluation test run, causing the workflow to execute via the internal workflow runner and resulting in unintended outbound API calls, data mutations, or other side effects in connected downstream systems. The issue primarily affects instances using the Evaluations feature where RBAC project roles grant workflow:read without workflow:execute. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L Added CWE CWE-863 Added Reference https://github.com/n8n-io/n8n/security/advisories/GHSA-hv7x-3x78-gx53 Added Reference https://www.vulncheck.com/advisories/n8n-incorrect-oauth-scope-validation-in-workflow-test-run-endpoint