CVE-2026-126387
Deferred Deferred - Pending Action

Arbitrary File Read in n8n via Browser Upload Tool

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
n8n before 2.46.1 contains an arbitrary file read vulnerability that allows authenticated members to read server files by supplying absolute paths to the Browser Use browser_upload tool. Attackers with a connected remote browser session can have Playwright read files such as instance configuration from the n8n server and retrieve their contents from the page.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-126387
EUVD
EUVD-2026-125178

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
n8n n8n to 2.46.1 (exc)
n8n n8n to 2.45.5 (exc)
n8n n8n to 3.0.1 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-36 The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize absolute path sequences such as "/abs/path" that can resolve to a location that is outside of that directory.

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Executive Summary

This vulnerability affects n8n versions before 2.46.1, allowing authenticated users to read arbitrary server files by supplying absolute paths to the Browser Use browser_upload tool. Playwright reads these files on the server side, potentially exposing sensitive data like instance configuration.

Detection Guidance

Check if the Browser Use feature is enabled by verifying the environment variable N8N_INSTANCE_AI_BROWSER_USE_ENABLED=true. Inspect n8n server logs for suspicious file path requests or Playwright activity. Review file access patterns for unauthorized reads of server files.

Impact Analysis

An attacker could access sensitive files on the n8n server, including configuration files, leading to data breaches or unauthorized information disclosure. Exploitation requires authentication and the Browser Use feature to be enabled.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, potentially violating GDPR (data protection) and HIPAA (health information privacy) by exposing personal or confidential information.

Mitigation Strategies

Upgrade n8n to version 2.46.1 or later. Disable the Browser Use feature by setting N8N_INSTANCE_AI_BROWSER_USE_ENABLED=false. Restrict access to authenticated users with minimal permissions. Monitor for unusual file access attempts.

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