CVE-2026-23873 HUSTOJ is Vulnerable to Stored CSV Injection (Formula Injection) in Contest Rank Export

hustoj is an open source online judge based on PHP/C++/MySQL/Linux for ACM/ICPC and NOIP training. All versions are vulnerable to CSV Injection Formula Injection through the contest rank export functionality contestrank.xls.php and admin/ranklistexport.php. The application fails to sanitize...