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TI-2023-19352 Aliases CVE-2023-37919

Cal.com not expiring old sessions after enabling 2FA

Priority MEDIUM 62CWE-613Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-613.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00314 24th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
calcomcal.comup to 3.1.4—No fix listedCNA
  • cal.com Vendorcalcom Affected up to 3.1.4 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cal:cal.com:*:*:*:*:*:*:*:*up to 3.1.4Vulnerablecalcom
  • cpe:2.3:a:cal:cal.com:*:*:*:*:*:*:*:* Versions up to 3.1.4 Vulnerable ·calcom

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-37919

References

Advisory 1

  • TI-2026-18911 Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback CVSS 4.0CRITICAL 10.0
  • TI-2025-40913 Cal.com Authentication Bypass via bad TOTP + password checks CVSS 4.0CRITICAL 9.9
  • TI-2023-01550 Improper Access Control in calcom/cal.com CVSS 3.1HIGH 8.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences