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    CVE-2025-66489

    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.

    Published:Dec 3, 2025
    Last Modified:Feb 13, 2026
    EPS:Dec 3, 2025
    EPSS Score:0.00116
    CVSS Score:9.8

    Affected Products

    Vendor
    Cal
    Product
    Cal.com

    Exploits

    https://github.com/calcom/cal.com/security/advisories/GHSA-9r3w-4j8q-pw98https://github.com/Ashwesker/Blackash-CVE-2025-66489

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-90 Reflection Attack in Authentication Protocol

    Related CVEs

    CVE-2025-71389 (CVSS 10) — Cal.com (calcom/cal.diy) before 5.9.9 is vulnerable to unauthenticated remote code execution because it bundle…
    CVE-2024-58355 (CVSS 9.3) — Cal.com (calcom/cal.diy) versions through 4.7.15 contain a stored cross-site scripting vulnerability. The sing…
    CVE-2024-58353 (CVSS 9.3) — Cal.com (repository calcom/cal.diy) in versions <= 4.7.15 is vulnerable to cross-site scripting (XSS) on the p…
    CVE-2026-23478 (CVSS 10) — Cal.com is open-source scheduling software. From 3.1.6 to before 6.0.7, there is a vulnerability in a custom N…
    CVE-2023-37919 (CVSS 6.5) — Cal.com is open-source scheduling software. A vulnerability allows active sessions associated with an account …
    CVE-2023-1647 (CVSS 8.8) — Improper Access Control in GitHub repository calcom/cal.com prior to 2.7. …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High