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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.

PUBLISHED Reserved 2026-01-13 | Published 2026-01-13 | Updated 2026-01-14 | Assigner GitHub_M




CRITICAL: 10.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L

Problem types

CWE-602: Client-Side Enforcement of Server-Side Security

CWE-639: Authorization Bypass Through User-Controlled Key

Product status

>= 3.1.6, < 6.0.7
affected

References

github.com/...al.com/security/advisories/GHSA-7hg4-x4pr-3hrg

cve.org (CVE-2026-23478)

nvd.nist.gov (CVE-2026-23478)

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