CVE-2026-24815 is a critical security vulnerability identified in datavane's tis software, specifically affecting versions before 4.3.0. The vulnerability stems from two related issues: CWE-434 (Unrestricted Upload of File with Dangerous Type) and CWE-502 (Deserialization of Untrusted Data). The affected component is XmlFile.Java within the tis-plugin module, which improperly handles file uploads without sufficient validation of file types or content. This allows an attacker to upload malicious files that the system subsequently deserializes without verifying their integrity or origin. Deserialization of untrusted data can lead to remote code execution, enabling attackers to execute arbitrary code on the server hosting tis. The vulnerability requires no authentication or user interaction and can be exploited remotely over the network. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (all rated high). The scope is changed (S:P), indicating that exploitation affects resources beyond the vulnerable component. Although no public exploits have been reported yet, the severity and ease of exploitation make this a critical threat. The vulnerability was published on January 27, 2026, and is assigned by GovTech CSG. The lack of available patches at the time of reporting increases the urgency for organizations to apply mitigations or upgrade once fixes are released.

For European organizations, the impact of CVE-2026-24815 is severe. Successful exploitation can lead to complete system compromise, allowing attackers to execute arbitrary code, steal sensitive data, disrupt services, or deploy ransomware. Organizations using datavane tis in critical infrastructure, financial services, healthcare, or government sectors face heightened risks due to the potential for data breaches and operational downtime. The vulnerability’s network accessibility and lack of authentication requirements mean attackers can target exposed instances remotely, increasing the attack surface. Given the high confidentiality, integrity, and availability impacts, exploitation could result in significant financial losses, regulatory penalties under GDPR, reputational damage, and operational disruption. The absence of known exploits currently provides a window for proactive defense, but the critical severity demands immediate attention to prevent future attacks.

European organizations should implement the following specific mitigations: 1) Immediately upgrade datavane tis to version 4.3.0 or later once available, as this version addresses the vulnerability. 2) Until patches are applied, restrict network access to the tis application using firewalls and network segmentation to limit exposure to trusted users and systems only. 3) Implement strict file upload validation controls, including whitelisting allowed file types, enforcing file size limits, and scanning uploaded files for malicious content. 4) Disable or restrict deserialization functionality where possible, or apply safe deserialization libraries that enforce strict type constraints and input validation. 5) Monitor application logs and network traffic for unusual file upload attempts or deserialization errors indicative of exploitation attempts. 6) Conduct regular security assessments and penetration testing focused on file upload and deserialization vectors. 7) Educate development and operations teams on secure coding practices related to file handling and deserialization. 8) Prepare incident response plans tailored to potential exploitation scenarios involving tis software.