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.

More information : https://github.com/calcom/cal.com/security/advisories/GHSA-7hg4-x4pr-3hrg