What is CVE-2025-59434?

CVE-2025-59434 is a critical-severity vulnerability in Flowiseai Flowise, classified under Information Disclosure. CVSS score: 9.6/10. Published 2025-09-22.

How severe is CVE-2025-59434?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Is CVE-2025-59434 known to be exploited?

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

Information disclosure in Flowiseai Flowise

CVE-2025-59434

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to August 2025 Cloud-Hosted Flowise, an authenticated vulnerability in Flowise Cloud allows any user on the free tier to access sensitive environment variables from other tenants via the Custom JavaScript Function node. This includes secrets such as OpenAI API keys, AWS credentials, Supabase tokens, and Google Cloud secrets — resulting in a full cross-tenant data exposure. This issue has been patched in the August 2025 Cloud-Hosted Flowise.

Vulnerability class: Information Disclosure

EPSS: 0.031 (86.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.

Affected products

Flowiseai Flowise — versions < cloud-hosted (as of Aug 2025)

Weakness classification (CWE)

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2025-59434?: CVE-2025-59434 is a critical-severity vulnerability in Flowiseai Flowise, classified under Information Disclosure. CVSS score: 9.6/10. Published 2025-09-22.
How severe is CVE-2025-59434?: Critical severity. CVSS v3 base score is 9.6 out of 10.
Is CVE-2025-59434 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.