Missing Authentication for Critical Function in Flowise - CVE-2026-56270
Published: April 15, 2026 / Updated: September 14, 2026
Vulnerability identifier: #VU126240
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-56270
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to missing authentication for a critical function in the /api/v1/loginmethod endpoint when handling GET requests with an organizationId parameter. A remote attacker can send a specially crafted request to disclose sensitive information.
The response can include OAuth client secrets in cleartext for an organization's configured SSO providers.
Affected software
Flowise
How to mitigate CVE-2026-56270
Install security update from vendor's website.
Flowise - update to 3.1.0