What is CVE-2026-16624?

CVE-2026-16624 is a critical-severity vulnerability in Cal.com Cal.diy, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.6/10. Published 2026-07-22.

How severe is CVE-2026-16624?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Auth bypass in Cal.com Cal.diy

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.

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.003 (20.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.

Affected products

Cal.com Cal.diy — versions 0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

Frequently asked questions

What is CVE-2026-16624?: CVE-2026-16624 is a critical-severity vulnerability in Cal.com Cal.diy, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.6/10. Published 2026-07-22.
How severe is CVE-2026-16624?: Critical severity. CVSS v3 base score is 9.6 out of 10.