CVE-2026-23478: Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback
calcom · cal.com
Affected: calcom cal.com · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 40% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- calcom · cal.com>= 3.1.6, < 6.0.7
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- calcom
- Published
- January 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-23478 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.