TI-2026-13873 Aliases CVE-2026-16624 GHSA-72qw-2qpq-fg7j

Authorization bypass in Cal.com Cal.diy

HIGH 76CWE-639Published 2026-07-22 · Updated 2026-07-27

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00355 29th percentileScored 2026-11-07

Fix Fixed Cal.diy (Cal.com): 6.2.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cal.com	Cal.diy	before 6.2.0	6.2.0	Patch available	CNA

Cal.diy VendorCal.com Affected before 6.2.0 Fixed in 6.2.0 Patch available CNA

Remediation

Fix · CNA Cal.diy (Cal.com) Fixed in 6.2.0

Timeline

2026-10-02 Threatist record created from CVE-2026-16624
2026-10-03 Alias added: GHSA-72qw-2qpq-fg7j

References

Other 2

TI-2026-41662 Cal.com Cal.diy 6.2.0 Stored XSS via BookingPageTagManager Analytics Tracking ID CVSS 4.0CRITICAL 9.3
TI-2025-22767 WordPress Cal.com plugin <= 1.0.0 - Cross Site Scripting (XSS) vulnerability CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences