Cal Cal.com vulnerabilities

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Published CVEs affecting Cal Cal.com: 2 record(s), with affected versions and fixes.
cpe:2.3:a:cal:cal.com

CVE-2026-23478 Critical · 9.8 CWE-602 Jan 13, 2026

Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback

Cal.com is open-source scheduling software. From 3.1.6 to before 6.0.7, there is a vulnerability in a custom NextAuth JWT callback that allows attackers to gain full authenticated access to any user's account by supplying a target email address via session.update(). This vulnerability is fixed in 6.0.7.

CVE-2025-66489 Critical · 9.8 CWE-303 Dec 3, 2025

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 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.