CVE-2026-23478
CRITICALDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 34% of all known CVEs.
References
Related Vulnerabilities
Other CWE-602 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2020-8162 | High | 7.5 | 3.0% | - | Fix |
| CVE-2024-23666 | High | 7.5 | 2.7% | - | Fix |
| CVE-2014-2374 | High | 7.5 | 1.9% | - | - |
| CVE-2014-2373 | High | 7.5 | 1.8% | - | - |
| CVE-2020-24683 | Critical | 9.8 | 1.5% | - | - |
| CVE-2017-14013 | Medium | 5.6 | 1.4% | - | - |
Common questions
How do I fix CVE-2026-23478?
Upgrade cal.com to 6.0.7 or later.
Is CVE-2026-23478 being actively exploited?
Not that we know of. CVE-2026-23478 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.41% is the estimated probability that it will be exploited in the next 30 days. That is higher than 34% of all scored CVEs.
How severe is CVE-2026-23478?
CVE-2026-23478 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-23478 affect?
Published advisories record a fix for cal.com (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-03.