CVE-2025-66489 — Cal.com Authentication Bypass via bad TOTP + password checks
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 provi…
Published: 2025-12-03 · CVSS: 9.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7