CVE-2025-64176 identifies an improper input validation vulnerability (CWE-20) in the ThinkDashboard application, a self-hosted bookmark dashboard built with Go and vanilla JavaScript. Versions 0.6.7 and earlier allow an attacker to upload arbitrary files to the /data directory via the backup import feature. The vulnerability arises because the application relies on client-side file-type verification, which can be bypassed by submitting a .zip file containing malicious payloads. This enables attackers to store malicious scripts or files on the server, potentially leading to stored cross-site scripting (CWE-79) attacks or malware distribution (CWE-434). The vulnerability does not require authentication or user interaction, making it remotely exploitable over the network. The CVSS 3.1 base score is 5.3 (medium), reflecting the lack of confidentiality impact but presence of integrity impact and ease of exploitation. The flaw is fixed in version 0.6.8, which presumably implements proper server-side validation and sanitization of uploaded backup files. No public exploits have been reported, but the risk remains significant for unpatched instances due to the potential for persistent XSS and malware hosting. The vulnerability highlights the dangers of relying solely on client-side validation and the importance of robust input validation on the server side.

For European organizations using ThinkDashboard versions prior to 0.6.8, this vulnerability could allow attackers to upload malicious files that execute stored XSS attacks or distribute malware. While confidentiality is not directly impacted, integrity and availability could be compromised if attackers leverage the vulnerability to inject malicious scripts that alter dashboard content or perform unauthorized actions. This could lead to reputational damage, data integrity issues, or further compromise of internal networks if malware is distributed. Organizations relying on ThinkDashboard for internal productivity or information sharing may face operational disruptions. The lack of authentication requirement increases the risk of exploitation by external threat actors. Although no exploits are currently known in the wild, the medium severity and ease of exploitation warrant prompt remediation to avoid potential targeted attacks, especially in sectors with high security requirements such as finance, government, and critical infrastructure within Europe.

1. Upgrade ThinkDashboard to version 0.6.8 or later immediately to apply the official fix. 2. Implement strict server-side validation of uploaded backup files, ensuring only expected file types and contents are accepted. 3. Restrict write permissions on the /data directory to minimize the impact of unauthorized file uploads. 4. Employ web application firewalls (WAFs) to detect and block suspicious upload attempts or malformed .zip files. 5. Monitor application logs for unusual upload activity or errors related to backup imports. 6. Conduct regular security audits and penetration testing focused on file upload functionalities. 7. Educate administrators and users about the risks of using outdated software versions and the importance of timely patching. 8. Consider isolating the ThinkDashboard instance within a segmented network zone to limit potential lateral movement if compromised.