Improper access control in Flowise - CVE-2026-56274
Published: May 18, 2026 / Updated: September 14, 2026
Vulnerability identifier: #VU131708
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-56274
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper access control in the MCP command validation logic when processing custom MCP server command configurations. A remote user can supply a crafted command such as a docker build invocation to execute arbitrary code.
Exploitation requires a Flowise account or an API key with view and update permissions for chatflows, and the target environment must have the docker command available.
Affected software
Flowise
How to mitigate CVE-2026-56274
Install security update from vendor's website.
Flowise - update to 3.1.2