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CVE-2026-23478 PoC — Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback

Source
https://github.com/Ashwesker/Ashwesker-CVE-2026-23478
Associated Vulnerability
Title: 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.
Description
CVE-2026-23478
File Snapshot

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