Unrated severityOSV Advisory· Published Jan 13, 2026· Updated Jan 14, 2026
Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback
CVE-2026-23478
Description
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 products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
1- github.com/calcom/cal.com/security/advisories/GHSA-7hg4-x4pr-3hrgmitrex_refsource_CONFIRM
News mentions
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