VULNERABILITY INTELLIGENCE

CVE-2026-56274

CVSS score9.9 CRITICAL
EPSS probability7.52%
CISA KEVNot currently listed
Published2026-06-23
Last modified2026-06-25
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Description

Flowise before 3.1.2 contains multiple OS command injection vulnerabilities in the Custom MCP Server feature due to incomplete command-flag validation and a regex bypass in local file access restrictions. An attacker with a Flowise account of any role, or API access with view/update permissions for chatflows, can configure a malicious MCP server to bypass the validateCommandFlags blocklist (for example, 'docker build' is not blocked, and 'npx --yes' is not blocked while only '-y' is) and the validateArgsForLocalFileAccess checks, resulting in execution of arbitrary commands on the Flowise host.

Weakness classification

  • disclosure@vulncheck.com: CWE-78

Primary references