CVE-2026-16624

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-16624
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-22 19:16:58 UTC
Updated2026-07-27 18:16:52 UTC
DescriptionCal.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.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from ADP

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

EPSS: 0.002810000 probability, percentile 0.203570000 (date 2026-07-29)

Problem Types: CWE-639 | CWE-639 Authorization Bypass Through User-Controlled Key | CWE-639 CWE-639 Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cal.com Cal.diy affected 6.2.0 custom Not specified

References

ReferenceSourceLinkTags
vokecyber.com/research/calcom-cross-tenant-webhook-plant 134c704f-9b21-4f2e-91b3-4a467353bcc0 vokecyber.com
github.com/calcom/cal.diy/security/advisories/GHSA-4fwh-xxpv-xfm6 [email protected] github.com
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