CVE-2026-9349: Calcom Cal.diy

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

A vulnerability was determined in calcom cal.diy up to 4.9.4. Affected by this issue is the function getServerSideProps of the file apps/web/modules/bookings/views/bookings-single-view.getServerSideProps.tsx of the component Generic React API. This manipulation of the argument cancelledBy/rescheduledBy causes information disclosure. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products

• Calcom Cal.diy: version 4.9.0 only; version 4.9.1 only; version 4.9.2 only; version 4.9.3 only; version 4.9.4 only

Published 2026-05-24. Last modified 2026-07-23.