Vulnerability DatabaseCVE-2025-66489
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CVE-2025-66489
December 03, 2025
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.
Affected Packages
https://github.com/calcom/cal.com.git (GITHUB):
Affected version(s) >=v1.0 <v5.9.8
Fix Suggestion:
Update to version v5.9.8
Related Resources (1)
https://github.com/calcom/cal.com/security/advisories/GHSA-9r3w-4j8q-pw98
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CVSS v4
Base Score:
9.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
NONE
CVSS v3
Base Score:
10
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Incorrect Implementation of Authentication Algorithm
CWE-303
EPSS
Base Score:
0.15