Vulnerability DatabaseCVE-2026-23478
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CVE-2026-23478
January 13, 2026
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.
Affected Packages
https://github.com/calcom/cal.com.git (GITHUB):
Affected version(s) >=v1.0 <v6.0.7
Fix Suggestion:
Update to version v6.0.7
Related Resources (1)
https://github.com/calcom/cal.com/security/advisories/GHSA-7hg4-x4pr-3hrg
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CVSS v4
Base Score:
10
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
LOW
CVSS v3
Base Score:
10
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Authorization Bypass Through User-Controlled Key
CWE-639
Client-Side Enforcement of Server-Side Security
CWE-602
EPSS
Base Score:
0.10