Information disclosure in n8n - CVE-2026-21858
Published: February 9, 2026 / Updated: April 17, 2026
Vulnerability identifier: #VU122486
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green
CVE-ID: CVE-2026-21858
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: n8n
Affected software:
n8n
n8n
Detailed vulnerability description
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a logic error in certain form-based workflows. A remote non-authenticated attacker can view contents of files on the server.
How to mitigate CVE-2026-21858
Install updates from vendor's website.