---
cve: "CVE-2025-71389"
severity: "CRITICAL"
cvss: 10.0
epss: "93%"
vendor: "calcom"
kev: false
exploited: false
published: "2026-07-23 21:16:44"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T10:26:08+02:00"
---

# CVE-2025-71389

> 10.0 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 46b88a3c81198b99c21abaa7888fefac0eec6c69 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-71389) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_