What is CVE-2025-8943?

CVE-2025-8943 is a critical-severity vulnerability in Flowiseai Flowise, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-08-14.

How severe is CVE-2025-8943?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-8943 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Flowiseai Flowise

CVE-2025-8943

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 contro…

Vulnerability class: Broken Authentication

EPSS: 0.723 (99.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Flowiseai Flowise

Weakness classification (CWE)

Public proof-of-concept exploits

References

reefs@jfrog.com (Exploit, Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2025-8943?: CVE-2025-8943 is a critical-severity vulnerability in Flowiseai Flowise, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-08-14.
How severe is CVE-2025-8943?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-8943 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.