CVE-2025-71389

· CRITICALDeferred

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CVSS v3.1

10.0

CVSS v4.0

10.0

EPSS

0.93%

Published

Jul 23, 2026

Modified

Jul 30, 2026

Public PoC / Exploit

All weaponized →

No public PoC or exploit code indexed for this CVE.

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

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.

CVSS Vector

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

Weaknesses (CWE)

CWE-94

References (4)

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

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