CVE-2026-113349
CVE-2026-113349 · OpenCATS before 0.10.0 Missing Authorization in Calendar editEvent/deleteEvent
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 5.3 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Affected products and versions
opencats
- Versions
- ≥ 0, < 0.10.0: Affected (custom)
Update to 0.10.0
Original sources
- https://github.com/opencats/OpenCATS/issues/720
- https://github.com/opencats/OpenCATS/commit/aa3b414c3672f5010ca26c44192aa8e72d3735bd
- https://github.com/opencats/OpenCATS/releases/tag/v0.10.0
- https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php#L555-L585
- https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php#L690-L712
- https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/lib/Calendar.php#L83-L150
- https://www.vulncheck.com/advisories/opencats-before-0.10.0-missing-authorization-in-calendar-editevent-deleteevent
- https://nvd.nist.gov/vuln/detail/CVE-2026-113349