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CVE-2026-56274

Flowiseai Flowise command injection

9.9 CRITICALPublic exploitEPSS 7.52%
  1. Published23 Jun 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Flowiseai Flowise< 3.1.2

Remediation

Fixed in
Flowiseai Flowise≥ 3.1.2

References

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Frequently asked

Is CVE-2026-56274 being actively exploited?

CVE-2026-56274 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 7.52%.

How severe is CVE-2026-56274?

CVE-2026-56274 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 7.52% probability of exploitation.

Which products are affected by CVE-2026-56274?

Affected products include Flowiseai Flowise.

How do I fix CVE-2026-56274?

Upgrade affected software to a fixed version, for example Flowiseai Flowise 3.1.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.