CVE-2026-23478

10.0 criticalEPSS 0.5%

Critical (10.0) in cal cal.com. EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

10.0 critical

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

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 40% of CVEs (scores of 2026-10-31)
CWEs: CWE-602, CWE-639
Published: 2026-01-13
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

cal:cal.com

References

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

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