CVE-2025-11655 identifies a security vulnerability in Total.js Flow, specifically within the SVG File Handler component, which permits unrestricted file uploads. The vulnerability arises from insufficient validation or restrictions on the types and contents of files that can be uploaded remotely, allowing attackers to upload arbitrary files, including potentially malicious payloads. The affected version is identified by a specific commit hash (673ef9144dd25d4f4fd4fdfda5af27f230198924), but due to the continuous delivery and rolling release model employed by Total.js, precise versioning and patch availability remain unclear. The vendor has not responded to disclosure attempts, and no official patches or updates have been released. The CVSS 4.0 base score is 5.1 (medium severity), with an attack vector of network (remote), low attack complexity, no privileges required, no user interaction, and limited impacts on confidentiality, integrity, and availability. The exploit is publicly available, increasing the likelihood of exploitation. The vulnerability could allow attackers to upload malicious files, potentially leading to remote code execution, data tampering, or denial of service depending on the uploaded payload and system configuration. The lack of authentication and user interaction requirements makes this vulnerability particularly concerning for exposed deployments. Organizations using Total.js Flow should be aware of this risk and implement compensating controls while awaiting vendor remediation.

For European organizations, this vulnerability poses a risk of unauthorized file uploads that could lead to remote code execution, data breaches, or service disruption. The impact on confidentiality includes potential exposure or modification of sensitive data if attackers upload scripts or malware that access internal resources. Integrity could be compromised through unauthorized modification or replacement of files. Availability might be affected if attackers upload payloads that cause system crashes or resource exhaustion. Organizations relying on Total.js Flow for critical applications or services could face operational disruptions and reputational damage. The public availability of exploit code increases the risk of opportunistic attacks, especially against internet-facing instances. European entities in sectors such as finance, healthcare, and government, which often use Node.js frameworks and have stringent data protection requirements under GDPR, may experience heightened consequences from exploitation. Additionally, the absence of vendor patches necessitates immediate risk mitigation to prevent exploitation.

1. Implement strict server-side validation of uploaded files, including file type, size, and content inspection, to prevent malicious uploads. 2. Employ allowlisting of acceptable file extensions and MIME types specifically for SVG uploads, and reject all others. 3. Use sandboxing or isolated environments to process uploaded files, minimizing potential damage from malicious payloads. 4. Restrict access to the upload functionality through network segmentation and firewall rules, limiting exposure to trusted networks or IP ranges. 5. Monitor logs and network traffic for unusual upload activity or attempts to upload executable or script files. 6. Disable or restrict SVG file handling if not required by the application. 7. Apply web application firewalls (WAF) with custom rules to detect and block suspicious upload attempts. 8. Maintain up-to-date backups and incident response plans to quickly recover from potential compromises. 9. Engage with the Total.js community or maintainers to track any forthcoming patches or updates addressing this vulnerability. 10. Consider alternative frameworks or components with better security track records if immediate remediation is not feasible.