CVE-2025-66489: cal.com before 5.9.8 (exclusive), < 5.9.8

CVE-2025-66489. CVSS 3.1 base score 9.8 (CRITICAL, NVD). EPSS 0.00842 (percentile 0.5715), scored 17-Oct-2026.

Affected technology

cal.com · before 5.9.8 (exclusive)
cal

cal.com · < 5.9.8
calcom

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

An attacker can bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. Vendor/CNA’s CVSS 4.0 assessment (base score 9.9/10) rates confidentiality, integrity and availability impact as high.

Published 18-Oct-2026 18:49 UTC

CWE: CWE-303
CCR priority: 39.4 /100 (P4)
CVSS 3.1: 9.8 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · NVD
EPSS: 0.00842 · percentile 0.5715 · 2026-10-17
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-18 18:49:36.049749+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2025-66489.html