CVE-2026-56359

EUVD-2026-42257
n8n before 2.8.0 contains a cross-site scripting vulnerability in the credential management flow where authenticated users can inject malicious JavaScript URLs into OAuth2 credential Authorization URL fields. Attackers can craft malicious credentials and trick victims into clicking the OAuth authorization button, executing arbitrary scripts in their browser session with the victim's privileges.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
5.4 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
n8nn8n
𝑥
< 2.8.0
CNA
n8nn8n
𝑥
< 2.6.4
CNA
Common Weakness Enumeration
References
https://github.com/n8n-io/n8n/security/advisories/GHSA-364x-8g5j-x2pr
https://www.vulncheck.com/advisories/n8n-cross-site-scripting-in-credential-management-oauth2-authorization-url