---
cve: "CVE-2025-66489"
severity: "CRITICAL"
cvss: 9.9
epss: "85%"
vendor: "calcom"
kev: false
exploited: false
published: "2025-12-03 20:16:27"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T22:44:56+02:00"
---

# CVE-2025-66489

> 9.9 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- fd6c6e6419dc4b19f8ec8132cd08d57bdfdaee43 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-66489) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_