CVE-2026-16624

CRITICAL

Cal.com Cal.diy < 6.2.0 - Authenticated Cross-Tenant Webhook Data Exposure via teamId Injection

Title source: llm

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.

References (2)

Core 2

Core References

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

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

Scores

CVSS v3 9.6

EPSS 0.0028

EPSS Percentile 20.4%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Details

CWE

CWE-639

Status published

Products (1)

Cal.com/Cal.diy < 6.2.0

Published Jul 22, 2026

Tracked Since Jul 23, 2026