What is CVE-2025-71389?

CVE-2025-71389 is a critical-severity vulnerability in Calcom Cal.diy, classified under Code Injection. CVSS score: 10.0/10. Published 2026-07-23.

How severe is CVE-2025-71389?

Critical severity. CVSS v3 base score is 10.0 out of 10.

RCE in Calcom Cal.diy

CVE-2025-71389

Cal.com (calcom/cal.diy) before 5.9.9 is vulnerable to unauthenticated remote code execution because it bundles a version of Next.js whose React Server Components (RSC) request handling deserializes attacker-controlled input. A remote atta…

Vulnerability class: RCE (Remote Code Execution)

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Calcom Cal.diy — versions 0, 5.9.9

Weakness classification (CWE)

CWE-94 — Code Injection

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (related)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2025-71389?: CVE-2025-71389 is a critical-severity vulnerability in Calcom Cal.diy, classified under Code Injection. CVSS score: 10.0/10. Published 2026-07-23.
How severe is CVE-2025-71389?: Critical severity. CVSS v3 base score is 10.0 out of 10.