CVE-2025-71389

CRITICAL SEVERITY

CVSS Score & Metrics

Base Score

10.0 / 10

Vector String

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

Vulnerability Description

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 attacker can send a crafted RSC request to the server and cause arbitrary code to be executed during server-side processing, without authentication or user interaction. The flaw derives from the upstream Next.js vulnerability CVE-2025-55182 and is resolved in 5.9.9 by updating the affected dependency.

Vulnerability Details

Published Date

July 23, 2026

Last Modified

July 23, 2026

CWE ID

CWE-94

Source

NVD

Vendor

calcom

Product

cal.diy

External References

https://github.com/advisories/GHSA-9qr9-h5gf-34mp
https://github.com/calcom/cal.diy/pull/25592
https://github.com/calcom/cal.diy/security/advisories/GHSA-qjx2-5xqp-cpf4
https://www.vulncheck.com/advisories/cal-com-before-remote-code-execution-via-rsc

CVE-2025-71389

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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