CVE-2026-113349 [MEDIUM] – OpenCATS before 0.10.0 contains a missing authorization vulnerability in CalendarUI::onEdi

OpenCATS before 0.10.0 contains a missing authorization vulnerability in CalendarUI::onEditEvent() and onDeleteEvent() that allows authenticated users to modify or delete other users’ calendar events. Attackers with EDIT or DELETE access can supply arbitrary eventID values to alter or remove any user’s events, including non-public ones restricted to their owner.