CVE-2026-112043 calcom cal.com/cal.diy Webhook util.ts createWebhookProcedure authorization
Attackers can bypass authorization checks in the webhook handler by manipulating the ID argument, potentially accessing unauthorized webhook data.
- 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-2026-112043?
CVE-2026-112043 is a medium-severity missing authorization vulnerability in calcom cal.com, published on 19 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A weakness has been identified in calcom cal.com and cal.diy up to 6.2.0. Impacted is the function createWebhookProcedure of the file packages/trpc/server/routers/viewer/webhook/util.ts of the component Webhook Handler. Executing a manipulation of the argument ID can lead to authorization bypass. It is possible to launch the attack remotely. The pull request to fix this issue awaits acceptance.
Which versions are affected by CVE-2026-112043?
How do I fix CVE-2026-112043?
No fix has been published for CVE-2026-112043 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-2026-112043 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112043 exists.
Sources
Also known as GHSA-6wcv-37vq-r5jx.