UpHeron
All vulnerabilities

Servers and applications

CVE-2026-126391

n8n before 1.123.89 RCE via Workflow Expression Evaluation Sandbox Escape

Severity
High 7.7
Published
13 Nov 2026
Last changed
13 Nov 2026
Added to UpHeron
13 Nov 2026
Fixed in
1.123.89, 2.45.5, 2.46.1, 3.0.1
Weakness
Code injection (CWE-94)
Attack
Over the network · Only under certain conditions · Needs a user account · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Sources
CVE Program

Description

n8n before 1.123.89 contains an insufficient isolation vulnerability in workflow expression evaluation that allows authenticated users to escape the sandbox. Attackers with permission to create or modify workflows can craft expressions referencing unexpected JavaScript properties to execute arbitrary code on the n8n host.

From the CVE Program.

Affected software

SoftwareAffected versions
n8nServers and applications · cna:n8n-io|n8n
  • Every version before 1.123.89
  • From 2.0.0 before 2.45.5
  • From 2.46.0 before 2.46.1
  • From 3.0.0 before 3.0.1

References

  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-126391