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I. Basic Information for CVE-2025-66489
Vulnerability Information
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Vulnerability Title
Cal.com Authentication Bypass via bad TOTP + password checks
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证算法的不正确实现
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cal.com 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cal.com是Cal.com开源的一个开源的日程安排软件。 Cal.com 5.9.8之前版本存在安全漏洞，该漏洞源于登录凭证提供程序存在逻辑缺陷，可能导致绕过密码验证和未授权访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
calcomcal.com < 5.9.8 -
II. Public POCs for CVE-2025-66489
#POC DescriptionSource LinkShenlong Link
1CVE-2025-66489https://github.com/Ashwesker/Blackash-CVE-2025-66489POC Details
2CVE-2025-66489https://github.com/Ashwesker/Ashwesker-CVE-2025-66489POC Details
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III. Intelligence Information for CVE-2025-66489
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IV. Related Vulnerabilities
Same product: cal.com
Same vendor: calcom
Same weakness: CWE-303
V. Comments for CVE-2025-66489

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