CVE-2024-58355: Calcom Cal.diy

High severity, CVSS 8.9. EPSS: 0.4% chance of exploitation in the next 30 days.

Cal.com (calcom/cal.diy) versions through 4.7.15 contain a stored cross-site scripting vulnerability. The single booking view (e.g., https://app.cal.com/booking/<id>) renders booking-question field labels via React's dangerouslySetInnerHTML without sanitizing or escaping user input. An attacker who can create an event type with a malicious booking-question label can inject arbitrary HTML/JavaScript that executes when a victim opens the crafted booking URL. The issue is fixed in v4.7.16.

Affected products

• Calcom Cal.diy: up to and including 4.7.15

Published 2026-07-23. Last modified 2026-07-30.