Critical severity · published Jun 25, 2026
CVE-2025-71333
Flowise - Arbitrary File Upload via Unauthenticated /api/v1/attachments Endpoint
9.8
CVSS
0.9%
EPSS
No
On KEV
Description
Flowise through 2.2.4 contains an unauthenticated arbitrary file upload vulnerability in the /api/v1/attachments endpoint when storageType is set to local. Attackers can exploit path traversal in the chatId and chatflowId parameters to upload malicious files to arbitrary directories, potentially enabling remote code execution and server compromise.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FL
Flowise · Flowise
through 2.2.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-71333
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-71333
Vendor Advisory
https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-h42x-xx2q-6v6g
Third Party Advisory
https://www.vulncheck.com/advisories/flowise-arbitrary-file-upload-via-unauthenticated-api-v1-attachments-endpoint
More from Flowise
9.9
CVE-2026-56274
Flowise - Remote Code Execution via MCP Security Bypass in validateCommandFlags and validateArgsForLocalFileAccess
9.8
CVE-2026-56271
Flowise - Weak Default JWT Secrets in Authentication Middleware
9.8
CVE-2025-71338
Flowise through 2.2.7 - Arbitrary File Write to Remote Code Execution via document-store API
9.8
CVE-2025-71336
Flowise - Unsandboxed Remote Code Execution via Custom MCP
9.8
CVE-2025-71334
Flowise - Arbitrary File Access via Missing Chat Flow ID Validation