Improper access control in Flowise - CVE-2026-70478
Published: July 30, 2026
Vulnerability identifier: #VU140084
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70478
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information and access connected third-party services.
The vulnerability exists due to improper access control in the OAuth2 token refresh endpoint when handling unauthenticated refresh requests for a credential ID. A remote attacker can send a crafted POST request to obtain a refreshed access token and access connected third-party services.
Exploitation requires knowledge of a credential ID, which may be obtained through enumeration or other information leaks.
Affected software
Flowise
How to mitigate CVE-2026-70478
Install security update from vendor's website.
Flowise - update to 3.1.3