CVE-2026-23478

CRITICAL

9.8

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published1/13/2026

Last Modified2/3/2026

Sourcenvd

Honeypot Sightings0

Affected Products

cal:cal.com

Weaknesses (CWE)

CWE-602CWE-639

References

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

IOC Correlations

No correlations recorded

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