by Kastro
Paper/Archive/CVE-2026-16624

CVE-2026-16624

Cal.com Cal.diy — CVE-2026-16624

EPSS 0.4%public exploitCVSS 9.6
critical.is priorityof 100
45
CVSS 9.6 (ADP)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 29.3.293 × 205.9Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Cal.diy< 6.2.06.2.0CNA

Scores by source

CISA ADP9.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

refgithub.com/calcom/cal.diy/security/advisories/GHSA-4fwh-xxpv-xfm6exploitvokecyber.com/research/calcom-cross-tenant-webhook-plant