CVE-2025-66489

critical · 9.9

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.

9.9

CVSS

0.8%

EPSS (exploit prob.)

56th

EPSS percentile

2025-12-03

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-303

Affected products

Vendor	Product	Affected versions
cal	cal.com	< 5.9.8

Check a specific version with /api/v1/cve/match.

References

https://github.com/calcom/cal.com/security/advisories/GHSA-9r3w-4j8q-pw98

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2025-66489