Improper access control in Flowise - CVE-2026-56277
Published: May 18, 2026 / Updated: September 14, 2026
Vulnerability identifier: #VU131711
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-56277
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to abuse stored credentials to generate speech cross-origin.
The vulnerability exists due to improper access control in the TTS generation endpoint when handling cross-origin requests. A remote attacker can send a request from any webpage to abuse stored credentials to generate speech cross-origin.
The issue bypasses the server's otherwise restrictive default CORS policy.
Affected software
Flowise
How to mitigate CVE-2026-56277
Install security update from vendor's website.
Flowise - update to 3.1.2