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NVD CRITICAL: CVE-2025-71389 — Cal.com (calcom/cal.diy) before 5.9.9 is vulnerable to unauthenticated remote co...

·Source: NIST NVD

Updated:

Executive 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 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 interacti

Analysis

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 Score: 10. Published: 2026-07-23T22:16:51.750.

Indicators of Compromise (3)

CVE (2)
CVE-2025-55182
NVDMITRE CVE
CVE-2025-71389
NVDMITRE CVE
Domain (1)
Cal.com
VirusTotalURLhaus
Source Attribution

Originally published by NIST NVD on Jul 23, 2026. Verified by: NIST.

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