n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling

CVE-2026-21858 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Impact

A vulnerability in n8n allows an attacker to access files on the underlying server through execution of certain form-based workflows. A vulnerable workflow could grant access to an unauthenticated remote attacker. This could result in exposure of sensitive information stored on the system and may enable further compromise depending on deployment configuration and workflow usage.

Patches

The issue has been fixed in n8n version 1.121.0. Users should upgrade to this version or later to remediate the vulnerability.

Workarounds

No official workarounds are available. As a temporary mitigation, users may restrict or disable publicly accessible webhook and form endpoints until upgrading.

Basic information

Type
reviewed
Severity
critical
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-01-07 19:20:19 UTC
Updated
2026-01-13 15:05:00 UTC
GitHub reviewed
2026-01-07 19:20:19 UTC
NVD published
2026-01-07

EPSS Score

Score Percentile
6.62% 91.21%

CVSS Scores

Base score Version Severity Vector
10.0 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.

Identifiers

Type Value
GHSA GHSA-v4pr-fm98-w9pg ↗
CVE CVE-2026-21858 ↗

CWEs

CWE id Name
CWE-20 Improper Input Validation

Credits

  • dorattias (reporter)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
npm n8n >= 1.65.0, < 1.121.0 1.121.0 —

References

cvelogic Threat Intelligence