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CVE-2025-8943

Flowiseai Flowise authentication bypass

9.8 CRITICALPublic exploitEPSS 74.8%
  1. Published14 Aug 2025

Description

The Custom MCPs feature is designed to execute OS commands, for instance, using tools like `npx` to spin up local MCP Servers. However, Flowise's inherent authentication and authorization model is minimal and lacks role-based access controls (RBAC). Furthermore, in Flowise versions before 3.0.1 the default installation operates without authentication unless explicitly configured. This combination allows unauthenticated network attackers to execute unsandboxed OS commands.

CVSS 3.1 breakdown

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

Affected products

Flowiseai Flowise< 3.0.1

Remediation

Fixed in
Flowiseai Flowise≥ 3.0.1

References

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Frequently asked

Is CVE-2025-8943 being actively exploited?

CVE-2025-8943 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 74.8%.

How severe is CVE-2025-8943?

CVE-2025-8943 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 74.8% probability of exploitation.

Which products are affected by CVE-2025-8943?

Affected products include Flowiseai Flowise.

How do I fix CVE-2025-8943?

Upgrade affected software to a fixed version, for example Flowiseai Flowise 3.0.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-8943 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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