CVE-2026-56274
CVE-2026-56274 · Flowise - Remote Code Execution via MCP Security Bypass in validateCommandFlags and validateArgsForLocalFileAccess
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.7 · High · EPSS 7.5% · Public exploit · Fix available
- Published
- Updated
Stack: node
Affected products and versions
flowise
- Versions
- ≥ 0, < 3.1.2: Affected (semver)
- 3.1.2: Not affected (semver)
Update to 3.1.2
flowise components
- Versions
- ≥ 0, < 3.1.2: Affected (semver)
- 3.1.2: Not affected (semver)
Update to 3.1.2
flowise npm
- Affected ranges
- SEMVER: < 3.1.2
Update to 3.1.2
flowise-components npm
- Affected ranges
- SEMVER: < 3.1.2
Update to 3.1.2