CVE-2026-41269

Flowise: File Upload Validation Bypass in createAttachment

State: Published
Severity: 7.1 High
Published: Apr 23, 2026
Updated: Apr 24, 2026
Reserved: Apr 18, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N	GitHub_M

Weaknesses

CWE-434 Unrestricted Upload of File with Dangerous Type

Affected Products

Product	Versions
FlowiseFlowiseAI	< 3.1.0Affected

References

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-rh7v-6w34-w2rr

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