CVE-2026-41269

HIGH

Flowise: File Upload Validation Bypass in createAttachment

Title source: cna
STIX 2.1

Description

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, the Chatflow configuration file upload settings can be modified to allow the application/javascript MIME type. This lets an attacker upload .js files even though the frontend doesn’t normally allow JavaScript uploads. This enables attackers to persistently store malicious Node.js web shells on the server, potentially leading to Remote Code Execution (RCE). This vulnerability is fixed in 3.1.0.

References (1)

Core 1
Core References

Scores

CVSS v3 7.1
EPSS 0.0047
EPSS Percentile 36.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-434
Status published
Products (3)
flowiseai/flowise < 3.1.0
FlowiseAI/Flowise < 3.1.0
npm/flowise 0 - 3.1.0npm
Published Apr 23, 2026
Tracked Since Apr 24, 2026