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CVE-2025-66489

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Date: December 3, 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.

Severity Score

Related Resources (3)

https://github.com/calcom/cal.com/security/advisories/GHSA-9r3w-4j8q-pw98
https://nvd.nist.gov/vuln/detail/CVE-2025-66489
https://www.mend.io/vulnerability-database/CVE-2025-66489

Severity Score

Weakness Type (CWE)

Incorrect Implementation of Authentication Algorithm

CWE-303

Top Fix

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Upgrade Version

Upgrade to version https://github.com/calcom/cal.com.git - v5.9.8

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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