CVE-2026-59206CWE-1321

n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration

High · published July 9, 2026

CVSS v4.0
7.1
EPSS
1%
Percentile
51.0
In the wild
Unconfirmed
What it is

n8n is an open source workflow automation platform. Prior to 1.123.61, 2.27.4, and, 2.28.1, an authenticated user with the default workflow:create permission could pollute Object.prototype through a crafted workflow saved, updated, or imported via the workflow API, allowing unauthenticated requests to be treated as a privileged user and exposing user and project listing endpoints. This issue is fixed in versions 1.123.61, 2.27.4, and 2.28.1.

The record
Technical detail
CVSS v4.0
7.1 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:L/SI:L/SA:N
EPSS
0.00660 · 51.0th percentile
Weakness
CWE-1321 · Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Published
2026-07-09T15:30Z
EPSS history
Timeline
  • 09 JUL 15:30Z
    n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration
    cvelistv5