Critical severity · published Sep 22, 2025
CVE-2025-59434
Critical Multi-Tenant Variable Disclosure in Flowise Cloud via Custom JavaScript Function
9.6
CVSS
3.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)3.6% · higher than 90% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FL
Flowise · FlowiseAI
< cloud-hosted (as of Aug 2025) · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-59434
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-59434
github.com
https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-435c-mg9p-fv22
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