Protection Mechanism Failure in n8n - #VU127201
Published: April 23, 2026
Vulnerability identifier: #VU127201
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: n8n
Affected software:
n8n
n8n
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass default guardrail instructions.
The vulnerability exists due to improper enforcement of guardrail instructions in the Guardrail node when processing crafted workflow input. A remote attacker can craft an input to bypass default guardrail instructions.
Remediation
Install security update from vendor's website.