CVE-2025-66489: Cal.com Authentication Bypass via bad TOTP + password checks
calcom · cal.com
Affected: calcom cal.com · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 62% of scored CVEs
DescriptionCVE.org
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 products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- calcom · cal.com< 5.9.8
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- calcom
- Published
- December 2025
CoverageNo articles yet
No CyberSIXT article names CVE-2025-66489 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.