CVE-2026-16624

Cal.com OSS ships lacks authorization on webhook teamId creation, allowing any authenticated user to create a webhook on any team via unvalidated teamId injection, then steal booking data, including fields like organizer/attendee emails and custom responses, and conditionally video-call passwords, by triggering webhook delivery.

Score

CVSS 3.1 9.6 Critical

Status

Awaiting Analysis - cret@cert.org

Published

2026-07-22

Last modified

2026-10-24

Weaknesses

CWE-639

Affected products

• Cal.diy (Cal.com)

References

• https://github.com/calcom/cal.diy/security/advisories/GHSA-4fwh-xxpv-xfm6
• https://vokecyber.com/research/calcom-cross-tenant-webhook-plant