CVE-2026-2684 identifies a vulnerability in the Tsinghua Unigroup Electronic Archives System, specifically in the file upload functionality located at /Archive/ErecordManage/uploadFile.html. The flaw allows an attacker to manipulate the 'File' argument to upload arbitrary files without any restrictions. This unrestricted upload capability means that an attacker can potentially upload malicious scripts or executables, leading to remote code execution or unauthorized access to the system. The vulnerability is remotely exploitable without requiring authentication or user interaction, increasing its risk profile. The CVSS 4.0 score of 6.9 reflects a medium severity, considering the ease of exploitation and the potential impact on confidentiality, integrity, and availability, albeit with limited scope and no privilege requirements. The vendor was notified but has not issued any patch or response, and no known exploits have been observed in the wild yet. The lack of patch availability means affected organizations must rely on compensating controls. The Electronic Archives System is likely used to manage sensitive documents and records, making the impact of compromise significant in terms of data confidentiality and integrity. The vulnerability's exploitation could lead to system takeover, data leakage, or disruption of archival services.

For European organizations, the impact of this vulnerability can be substantial, especially for those in government, legal, healthcare, or financial sectors that rely on Tsinghua Unigroup's Electronic Archives System for managing critical records. Unrestricted file upload can lead to remote code execution, allowing attackers to gain persistent access, manipulate or exfiltrate sensitive archived data, or disrupt archival services. This threatens confidentiality, integrity, and availability of vital records. Given the system’s role in document management, exploitation could undermine regulatory compliance (e.g., GDPR), damage organizational reputation, and cause operational downtime. The lack of vendor response and patch availability increases exposure time, raising the risk of targeted attacks or opportunistic exploitation. European entities with interconnected networks may also face lateral movement risks if the system is compromised.

Until an official patch is released, European organizations should implement strict network segmentation to isolate the Electronic Archives System from broader enterprise networks. Deploy web application firewalls (WAFs) with custom rules to detect and block suspicious file upload attempts targeting the /Archive/ErecordManage/uploadFile.html endpoint. Monitor logs for unusual upload activity and scan uploaded files for malware. Restrict access to the upload functionality by IP whitelisting or VPN-only access where feasible. Employ intrusion detection/prevention systems (IDS/IPS) tuned to detect exploitation attempts. Conduct regular security audits and penetration tests focusing on file upload mechanisms. Educate administrators to recognize signs of compromise and prepare incident response plans. Finally, engage with the vendor or community to track patch developments and apply updates promptly once available.