CVE-2026-104054 calcom cal.diy PBAC Permission BookingAccessService.ts doesUserIdHaveAccessToBooking authorization
Attackers can bypass authorization checks in the PBAC engine to access or modify booking data without proper permissions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104054?
CVE-2026-104054 is a medium-severity missing authorization vulnerability in calcom cal.diy, published on 2 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security flaw has been discovered in calcom cal.diy up to 6.2.0. This affects the function doesUserIdHaveAccessToBooking of the file BookingAccessService.ts of the component PBAC Permission Engine. Performing a manipulation results in missing authorization. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The pull request to fix this issue awaits acceptance.
Which versions are affected by CVE-2026-104054?
How do I fix CVE-2026-104054?
No fix has been published for CVE-2026-104054 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-104054 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104054 exists.
Sources
Also known as GHSA-48q5-8whv-r6xj.