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    CVE-2026-23478

    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.

    Published:Jan 13, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 13, 2026
    EPSS Score:0.00109
    CVSS Score:9.8

    Affected Products

    Vendor
    Cal
    Product
    Cal.com

    Exploits

    No exploit reference

    Related CVEs

    CVE-2025-71389 (CVSS 10) — Cal.com (calcom/cal.diy) before 5.9.9 is vulnerable to unauthenticated remote code execution because it bundle…
    CVE-2024-58355 (CVSS 9.3) — Cal.com (calcom/cal.diy) versions through 4.7.15 contain a stored cross-site scripting vulnerability. The sing…
    CVE-2024-58353 (CVSS 9.3) — Cal.com (repository calcom/cal.diy) in versions <= 4.7.15 is vulnerable to cross-site scripting (XSS) on the p…
    CVE-2025-66489 (CVSS 9.9) — Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an…
    CVE-2023-37919 (CVSS 6.5) — Cal.com is open-source scheduling software. A vulnerability allows active sessions associated with an account …
    CVE-2023-1647 (CVSS 8.8) — Improper Access Control in GitHub repository calcom/cal.com prior to 2.7. …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High