CVE-2026-23478
Last modified
CVE-2026-23478 is a critical-severity vulnerability rated 10/10 on the CVSS scale. 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(). EPSS estimates a 0.40% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cal | Cal.Com | >= 3.1.6, < 6.0.7 |
References
- https://github.com/calcom/cal.com/security/advisories/GHSA-7hg4-x4pr-3hrgThird Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-23478?
How severe is CVE-2026-23478?
How do I fix CVE-2026-23478?
Are you affected by CVE-2026-23478?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST