CVE-2023-1647 Improper Access Control in calcom/cal.com

High 8.8 Published 27 Mar 2023 Updated 19 Feb 2025

Attackers can bypass access controls to read or modify data in the Cal.com scheduling application.

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-2023-1647?

CVE-2023-1647 is a high-severity missing authorization vulnerability in calcom/cal.com, published on 27 Mar 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Improper Access Control in GitHub repository calcom/cal.com prior to 2.7.

Weakness: CWE-284

Which versions are affected by CVE-2023-1647?

It affects 1 product.

Products include Cal Cal.com.

How do I fix CVE-2023-1647?

No fix has been published for CVE-2023-1647 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-2023-1647 being exploited?

There is no known exploitation of CVE-2023-1647 in the wild and no public exploit code.

Sources

Also known as GHSA-976q-qhh2-p88c.