Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker to bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. This issue exists due to problematic conditional logic in the authentication flow. This vulnerability is fixed in 5.9.8.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

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History

Wed, 03 Dec 2025 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 03 Dec 2025 20:00:00 +0000

Type Values Removed Values Added
Description Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker to bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. This issue exists due to problematic conditional logic in the authentication flow. This vulnerability is fixed in 5.9.8.
Title Cal.com Authentication Bypass via bad TOTP + password checks
Weaknesses CWE-303
References
Metrics cvssV4_0

{'score': 9.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-12-03T21:48:27.861Z

Reserved: 2025-12-02T22:44:04.707Z

Link: CVE-2025-66489

cve-icon Vulnrichment

Updated: 2025-12-03T21:48:23.065Z

cve-icon NVD

Status : Received

Published: 2025-12-03T20:16:27.057

Modified: 2025-12-03T20:16:27.057

Link: CVE-2025-66489

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.