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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.

PUBLISHED Reserved 2025-12-02 | Published 2025-12-03 | Updated 2025-12-03 | Assigner GitHub_M




CRITICAL: 9.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N

Problem types

CWE-303: Incorrect Implementation of Authentication Algorithm

Product status

< 5.9.8
affected

References

github.com/...al.com/security/advisories/GHSA-9r3w-4j8q-pw98

cve.org (CVE-2025-66489)

nvd.nist.gov (CVE-2025-66489)