CVE-2020-26799

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

A reflected cross-site scripting (XSS) vulnerability was discovered in index.php on Luxcal 4.5.2 which allows an unauthenticated attacker to steal other users' data.

Published 2025-07-21. Last modified 2026-06-17.