Cal vulnerabilities
Published CVEs affecting Cal products: 2 record(s), with severity, exploitation and fixes.
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.