Missing Authentication for Critical Function in Flowise - #VU140071
Published: July 30, 2026
Vulnerability identifier: #VU140071
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: N/A
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to obtain fresh OAuth2 access tokens for any credential.
The vulnerability exists due to improper access control in the OAuth2 refresh endpoint when processing token refresh requests for credentials looked up by ID without workspace scoping. A remote user can send a token refresh request for another credential to obtain fresh OAuth2 access tokens for any credential.
The refresh endpoint is whitelisted from authentication, and the server returns the refreshed access token in the response body.
Affected software
Flowise
Remediation
Install security update from vendor's website.
Flowise - update to 3.1.3