Vulnerability record · CVE-2026-16624 · published 22 July 2026

CVE-2026-16624: Insecure direct object reference vulnerability

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.

9.6 CVSS 3.1 Critical EPSS 0.40% · top 68.9% CWE-639 · Insecure direct object reference Awaiting Analysis

9.6CVSS 3.1 base score

0.40%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

3References

27 Jul 2026Last modified by NVD

Description

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

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.4CVE-2026-55255Langflow IDOR in responses endpoint allows cross-user flow executionLangflow before 1.9.1 has an insecure direct object reference in the /api/v1/responses endpoint. An authenticated attacker can supply another user's …KEVEPSS 0.89%analysed23 Jun 2026

Source: NIST National Vulnerability Database (record CVE-2026-16624), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.