CVE-2026-113349
OpenCATS before 0.10.0 Missing Authorization in Calendar editEvent/deleteEvent
opencats OpenCATS
CVSS
5.3MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.21%Chance of exploitation activity in the next 30 days, higher than 10% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 0.10.0OpenCATSCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
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.
Text from CVE List
Affected versions 1
- OpenCATSaffected: all versions before 0.10.0CVE List
References 7
- github.com/opencats/OpenCATS/commit/aa3b414c3672f5010ca26c44192aa8e72d3735bdFixvia CVE List
- github.com/opencats/OpenCATS/releases/tag/v0.10.0Fixvia CVE List
- vulncheck.com/advisories/opencats-before-0.10.0-missing-authorization-in-calendar-editevent-deleteeventAdvisoryvia CVE List
- github.com/opencats/OpenCATS/issues/720Referencevia CVE List
- github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php#L555-L585Referencevia CVE List
- github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php#L690-L712Referencevia CVE List
- github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/lib/Calendar.php#L83-L150Referencevia CVE List