CVE-2026-16624 | Cal.com OSS ships lacks authorization on webhook teamId crea… | CVSS 9.6 CRITICAL

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.

Metadata

CVE ID: CVE-2026-16624
State: PUBLISHED
Assigner: certcc
Reserved: 2026-07-22 15:02 UTC
Published: 2026-07-22 18:31 UTC
Last updated: 2026-07-27 17:10 UTC
Primary CWE: CWE-639
CWE-639 Authorization Bypass Through User-Controlled Key
Vendor / Product: Cal.com / Cal.diy
Sources: cve.org · NVD

Severity & Metrics

9.6 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Cal.com	Cal.diy	—	0 < 6.2.0

Weakness (CWE)

CWE	Source	Description
—	cna	CWE-639 Authorization Bypass Through User-Controlled Key
CWE-639	adp	CWE-639 Authorization Bypass Through User-Controlled Key

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.6	CRITICAL	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

References (2)