CVE-2023-37919: Cal.com not expiring old sessions after enabling 2FA

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-07-25 · updated 2026-06-17
Weakness: CWE-613

Description

Cal.com is open-source scheduling software. A vulnerability allows active sessions associated with an account to remain active even after enabling 2FA. When activating 2FA on a Cal.com account that is logged in on two or more devices, the account stays logged in on the other device(s) stays logged in without having to verify the account owner's identity. As of time of publication, no known patches or workarounds exist.

Affected products

calcom cal.com: through 3.1.4

References

https://github.com/calcom/cal.com/security/advisories/GHSA-cpf2-q635-xrwx
https://github.com/calcom/cal.com/security/advisories/GHSA-cpf2-q635-xrwx

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