# CVE-2025-66489

## Summary

- **CVE ID:** CVE-2025-66489
- **Severity:** CRITICAL
- **CVSS Score:** 9.9 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N)
- **CWE:** CWE-303
- **Published:** Dec 3, 2025
- **Last Modified:** Mar 13, 2026

## 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

- calcom — cal.com (< 5.9.8)

## References

- [CNA](https://github.com/calcom/cal.com/security/advisories/GHSA-9r3w-4j8q-pw98)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.84%
- **EPSS Percentile:** 55.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._