CVE-2025-66489 Details
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.
An authentication bypass vulnerability has been identified in Cal.com scheduling software, affecting versions prior to 5.9.8. The flaw allows attackers to bypass password verification by providing a TOTP code, potentially leading to unauthorized access to user accounts. This issue arises from faulty conditional logic in the authentication process. The vulnerability exists in the login credentials provider, specifically within the 'authorize()' function of the NextAuth options file.
Users can update to Cal.com version 5.9.8 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Dec 3, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/calcom/cal.com/security/advisories/GHSA-9r3w-4j8q-pw98 | [email protected] | ExploitThird Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-303 | Incorrect Implementation of Authentication Algorithm | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| cal cal.com | < 5.9.8 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Feb 13, 2026 | Initial Analysis | [email protected] |
| Dec 3, 2025 | New CVE Received | [email protected] |