CVE-2026-27577Network attack vector

Authenticated command execution via expression sandbox escape

Published Feb 25, 2026 · Updated Feb 25, 2026

Code injection in n8n before 1.123.22, 2.0.0 through 2.9.2, and 2.10.0 allows remote authenticated users to execute host commands. The expression AST sanitizer fails to block dynamic class inheritance, reserved-name rebinding, spread access to Node.js globals, and dangerous runtime properties before Tournament evaluates workflow parameters. Workflow creation or editing permission is required; successful exploitation runs commands with the n8n process's host privileges.

CVSS severity9.4
Critical
EPSS probability9.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Code injection in n8n before 1.123.22, 2.0.0 through 2.9.2, and 2.10.0 allows remote authenticated users to execute host commands. The expression AST sanitizer fails to block dynamic class inheritance, reserved-name rebinding, spread access to Node.js globals, and dangerous runtime properties before Tournament evaluates workflow parameters. Workflow creation or editing permission is required; successful exploitation runs commands with the n8n process's host privileges.

The record

CVE
CVE-2026-27577
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
n8n
Product
n8n
Classifications
CWE-94, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.123.22
  2. Affected versionversion=>= 2.0.0, < 2.9.3
  3. Affected versionversion=>= 2.10.0, < 2.10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

n8n · n8nversion=< 1.123.22; version=>= 2.0.0, < 2.9.3; version=>= 2.10.0, < 2.10.1

Published CVSS scores

9.4GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
9.9NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo