CVE-2025-11655 is a security vulnerability identified in the Total.js Flow framework, specifically within the SVG File Handler component. The flaw allows an attacker to perform unrestricted file uploads remotely without requiring user interaction or authentication, which means an unauthenticated remote attacker can upload arbitrary files to the server. The vulnerability arises from insufficient validation or restrictions on the file upload mechanism in an unknown function of the SVG File Handler. The affected version is identified by a specific commit hash (673ef9144dd25d4f4fd4fdfda5af27f230198924), but due to the product's continuous delivery model with rolling releases, exact versioning and patch availability are unclear. The vendor has not responded to early disclosure attempts, and no patches or updates have been publicly announced. The CVSS 4.0 base score is 5.1 (medium severity), reflecting network attack vector, low complexity, no privileges required, no user interaction, and limited impact on confidentiality, integrity, and availability. While no known exploits are currently in the wild, the public release of the exploit code increases the risk of exploitation. The vulnerability could allow attackers to upload malicious files such as web shells or malware, potentially leading to server compromise, data leakage, or service disruption. The lack of scope change indicates the impact is limited to the vulnerable component without affecting other system components directly.

For European organizations, the unrestricted upload vulnerability in Total.js Flow could lead to unauthorized file uploads that compromise server integrity and confidentiality. Attackers could deploy web shells or malware, enabling further lateral movement or data exfiltration. Organizations using Total.js Flow in web applications, especially those handling SVG files or other user-uploaded content, face increased risk of compromise. This could impact sectors with sensitive data such as finance, healthcare, and government. The continuous delivery model complicates patch management, potentially delaying remediation. Additionally, the lack of vendor response may hinder coordinated vulnerability management. The impact on availability is limited but possible if attackers upload files that disrupt service or consume resources. European entities with web infrastructure built on Node.js frameworks or using Total.js Flow components are particularly vulnerable. The medium severity suggests a moderate risk, but exploitation ease and public exploit availability elevate the threat level, necessitating proactive defense measures.

1. Immediately restrict or disable the SVG File Handler upload functionality if not essential. 2. Implement strict server-side validation of uploaded files, including file type, size, and content inspection, to prevent malicious uploads. 3. Employ allow-listing for permitted file extensions and reject all others. 4. Use sandboxing or isolated environments for handling uploaded files to limit potential damage. 5. Monitor logs and network traffic for unusual upload activity or access patterns indicative of exploitation attempts. 6. Apply web application firewalls (WAF) with custom rules to detect and block suspicious upload requests targeting the SVG File Handler. 7. Maintain up-to-date backups and incident response plans to quickly recover from potential compromises. 8. Engage with the Total.js community or monitor official channels for patches or updates addressing this vulnerability. 9. Conduct internal code reviews and penetration testing focusing on file upload components to identify and remediate similar weaknesses. 10. Educate development and operations teams about the risks of unrestricted file uploads and secure coding practices.