CVE-2026-16624

Published: Jul 22, 2026Modified: Jul 27, 2026

9.6

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Exploitability: 3.1 / Impact: 5.8

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

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.

Related CWEs

CWE-639

Authorization Bypass Through User-Controlled Key

The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

References (3)

https://github.com/calcom/cal.diy/security/advisories/GHSA-4fwh-xxpv-xfm6

Source: cret@cert.org

https://vokecyber.com/research/calcom-cross-tenant-webhook-plant

Source: cret@cert.org

https://vokecyber.com/research/calcom-cross-tenant-webhook-plant

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.