CVE-2025-26319 in Flowise
Summary
by MITRE • 03/05/2025
FlowiseAI Flowise v2.2.6 was discovered to contain an arbitrary file upload vulnerability in /api/v1/attachments.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 06/24/2025
The vulnerability identified as CVE-2025-26319 affects FlowiseAI Flowise version 2.2.6 and represents a critical arbitrary file upload flaw within the application's attachment handling functionality. This vulnerability exists in the /api/v1/attachments endpoint which processes file uploads from users without proper validation or sanitization of file types and content. The flaw allows authenticated attackers to upload malicious files to the server, potentially leading to remote code execution or other severe security consequences. FlowiseAI is an open-source AI workflow platform that enables users to create and deploy AI-powered applications through visual drag-and-drop interfaces, making it a target for attackers seeking to compromise AI development environments.
The technical implementation of this vulnerability stems from insufficient input validation and file type checking within the attachment upload API endpoint. Attackers can bypass normal file restrictions by uploading files with malicious extensions or content that appears legitimate but contains harmful code. The vulnerability directly maps to CWE-434 which describes insecure file upload vulnerabilities where applications fail to properly validate or sanitize uploaded files. This weakness allows attackers to upload executable scripts, web shells, or other malicious payloads that can be executed on the server hosting the FlowiseAI application. The issue is particularly concerning because it affects the core functionality of the platform that handles user-generated content, making it a prime target for exploitation in environments where multiple users interact with the system.
The operational impact of this vulnerability extends beyond simple data compromise to potentially enable full system compromise. An attacker who successfully exploits this vulnerability could gain persistent access to the server hosting FlowiseAI, allowing for data exfiltration, privilege escalation, or use as a pivot point for attacking other systems within the network. The vulnerability affects organizations using FlowiseAI for AI development workflows, potentially exposing sensitive training data, proprietary algorithms, or development artifacts. This risk is exacerbated by the fact that FlowiseAI is designed for collaborative AI development, meaning multiple users may have access to the system, increasing the attack surface. The vulnerability also aligns with ATT&CK technique T1190 which describes exploitation of vulnerabilities in web applications to gain initial access to target systems.
Mitigation strategies for CVE-2025-26319 should include immediate patching of the FlowiseAI application to version 2.2.7 or later which contains the necessary security fixes. Organizations should implement strict file type validation and content inspection mechanisms to prevent malicious file uploads, including rejecting executable files and performing thorough malware scanning of all uploaded content. Network segmentation and access controls should be enforced to limit the potential impact of successful exploitation, while monitoring systems should be deployed to detect unusual file upload patterns or attempts to access uploaded files. Security teams should also consider implementing web application firewalls to filter malicious upload attempts and regularly audit the attachment handling functionality to ensure proper validation mechanisms remain in place. Additionally, organizations should conduct security awareness training for users who have access to the FlowiseAI platform to prevent social engineering attacks that might exploit this vulnerability.