CVE-2026-56359

n8n - Cross-Site Scripting in Credential Management OAuth2 Authorization URL

State: Published
Severity: 4.8 Medium
Published: Jul 8, 2026
Updated: Oct 29, 2026
Reserved: Jun 20, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	4.8 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N	VulnCheck
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N	VulnCheck

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
n8nn8n	2.7.0 to before 2.8.0Affected 2.8.0Not affected
n8nn8n	before 2.6.4Affected 2.6.4Not affected

References

GitHub Security Advisory (GHSA-364x-8g5j-x2pr)vendor-advisory
VulnCheck Advisory: n8n - Cross-Site Scripting in Credential Management OAuth2 Authorization URLthird-party-advisory

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