Cal.com Security Update Advisory (CVE-2025-66489)

Overview

 

We have released a security update to address a vulnerability in Cal.com. Users of affected products are advised to update to the latest version.
 

 

Affected Products

 

CVE-2025-66489

 

Cal.com Version: 5.9.7 and earlier

 

 

Resolved Vulnerabilities

 

Authentication bypass vulnerability due to incorrect TOTP and password validation in Cal.com (CVE-2025-66489)

 

 

Vulnerability Patches

Vulnerability Patches have been made available with the latest updates. Please follow the instructions on the Referenced Sites to update to the latest Vulnerability Patches version.

 

CVE-2025-66489

 

Cal.com Version: 5.9.8

 

 

References

 

[1] Authentication Bypass via bad TOTP + password checks
https://github.com/calcom/cal.com/security/advisories/GHSA-9r3w-4j8q-pw98