---
id: CVE-2025-71389
title: >-
  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
summary: >-
  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 at…
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-94
published: '2026-07-23'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T14:10:00.117'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-71389'
references:
  - url: 'https://github.com/advisories/GHSA-9qr9-h5gf-34mp'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/calcom/cal.diy/pull/25592'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/calcom/cal.diy/security/advisories/GHSA-qjx2-5xqp-cpf4'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/cal-com-before-remote-code-execution-via-rsc
    label: disclosure@vulncheck.com
tags:
  - nvd
  - exploit-available
epss: 0.01354
epssPercentile: 0.70497
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/0xdak/CVE-2025-71389_exploit'
  checkedAt: '2026-09-29T14:36:48.263Z'
exploitAvailable: true
ingestedAt: '2026-09-29T14:36:14.069Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.