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.
Scores
CVSS v3
9.8
EPSS
0.0011
EPSS Percentile
28.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
CWE
CWE-602
CWE-639
Status
published
Products (1)
cal/cal.com
3.1.6 - 6.0.7
Published
Jan 13, 2026
Tracked Since
Feb 18, 2026