Threat database

CVE-2026-24479 is a critical path traversal vulnerability in the zhblue hustoj online judge platform prior to version 26.01.24. The vulnerability exists in the problem_import_qduoj.php and problem_import_hoj.php modules, which improperly sanitize filenames within uploaded ZIP archives. An attacker can craft a malicious ZIP containing files with path traversal sequences (e.g. , .. /..

CVE-2026-23873 is a medium-severity CSV Injection vulnerability affecting all versions of the open-source online judge system hustoj (<= 26.01.01). The vulnerability arises from improper sanitization of user input in the 'Nickname' field when exporting contest rankings to Excel-compatible . xls files. Malicious users can inject Excel formulas that execute upon opening the exported file by administrators, potentially leading to remote code execution or data exfiltration on the administrator's machine. Exploitation requires an attacker to have a low-privilege account and some user interaction (administrator opening the file). No patch is currently available. European organizations using hustoj for programming contests or training should be cautious, especially educational institutions and competitive programming platforms. Mitigations include disabling automatic formula execution in Excel, sanitizing user inputs before export, and restricting export functionality to trusted users.