{"id":"CVE-2026-113349","title":"OpenCATS before 0.10.0 Missing Authorization in Calendar editEvent/deleteEvent","summary":"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…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-639"],"vendor":"opencats","product":"OpenCATS","affected":["OpenCATS < 0.10.0"],"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T10:41:36.105Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-113349","references":[{"url":"https://github.com/opencats/OpenCATS/issues/720"},{"url":"https://github.com/opencats/OpenCATS/commit/aa3b414c3672f5010ca26c44192aa8e72d3735bd"},{"url":"https://github.com/opencats/OpenCATS/releases/tag/v0.10.0","label":"OpenCATS v0.10.0 Release Notes"},{"url":"https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php#L555-L585"},{"url":"https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php#L690-L712"},{"url":"https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/lib/Calendar.php#L83-L150"},{"url":"https://www.vulncheck.com/advisories/opencats-before-0.10.0-missing-authorization-in-calendar-editevent-deleteevent","label":"VulnCheck Advisory: OpenCATS before 0.10.0 Missing Authorization in Calendar editEvent/deleteEvent"}],"tags":["cve.org"],"ingestedAt":"2026-10-20T12:05:07.326Z","slug":"CVE-2026-113349","body":"## Overview\n\nOpenCATS 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.\n\n## Affected\n\n- `OpenCATS < 0.10.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}