Prototype pollution in n8n - CVE-2026-33696
Published: April 23, 2026
Vulnerability identifier: #VU127207
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33696
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to prototype pollution in the GSuiteAdmin node when processing crafted node configuration parameters. A remote user can supply a crafted parameter to write attacker-controlled values onto Object.prototype to execute arbitrary code.
Exploitation requires permission to create or modify workflows.
Affected software
n8n
How to mitigate CVE-2026-33696
Install security update from vendor's website.
n8n - addressed in versions 1.123.27, 2.13.3, 2.14.1