CVE-2026-63768: Calcom Cal.diy

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

cal.diy through 6.2.0 contains an open redirect vulnerability in the conferencing OAuth callback endpoint that allows attackers to redirect users to arbitrary URLs by crafting malicious state parameters. Attackers can exploit the unsigned state parameter and onErrorReturnTo field to silently redirect visitors from the trusted domain to attacker-controlled URLs for phishing attacks.

Affected products

• Calcom Cal.diy: up to and including 6.2.0

Published 2026-07-20. Last modified 2026-09-17.