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OpenAdvisories
Critical · 9.9 CVE-2025-66489 EUVD-2025-201128

Cal.com Authentication Bypass via bad TOTP + password checks

Published Dec 3, 2025 · Updated Dec 3, 2025 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
calcom cal.com < 5.9.8 —

References