---
cve: "CVE-2026-16624"
severity: "CRITICAL"
cvss: 9.6
epss: "0.4%"
vendor: "Cal.com"
kev: false
exploited: false
published: "2026-07-22 19:16:58"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-03T14:37:28+02:00"
---

# CVE-2026-16624

> 9.6 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 1c193cca8682b33b9866c792186033f7ef886682 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-16624) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_