Improper access control in Flowise - CVE-2025-71336
Published: May 4, 2026 / Updated: September 14, 2026
Vulnerability identifier: #VU129618
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-71336
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to improper access control in the Custom MCP feature when handling requests to load custom MCP server configurations. A remote attacker can send a specially crafted request to execute arbitrary code.
By default, installations may operate without authentication unless credentials are explicitly configured.
Affected software
Flowise
How to mitigate CVE-2025-71336
Install security update from vendor's website.
Flowise - update to 3.0.6