CVE-2026-41269: Flowise: File Upload Validation Bypass in createAttachment
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-41269?
CVE-2026-41269 is classified as a high severity vulnerability due to its potential for file upload validation bypass.
How do I fix CVE-2026-41269?
To fix CVE-2026-41269, update Flowise to version 3.1.0 or later, which addresses the file upload validation issue.
What is affected by CVE-2026-41269?
CVE-2026-41269 affects Flowise versions prior to 3.1.0, specifically in the Chatflow configuration settings.
What type of attack does CVE-2026-41269 enable?
CVE-2026-41269 enables attackers to upload malicious files by bypassing the intended file upload validation.
Is CVE-2026-41269 related to any specific feature in Flowise?
Yes, CVE-2026-41269 specifically relates to the createAttachment feature in Flowise's drag & drop interface.