CVE-2025-71389: critical vulnerability in calcom cal.diy
Cal.com before 5.9.9 Remote Code Execution via RSC
Published · Updated
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48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 10epss 1.4%
from disclosure to weapon5 days
Published on NVDJul 23
1st PoC+5d
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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Affected products
calcom · cal.diypublic PoCs found — 1
githubgithub.com/0xdak/CVE-2025-71389_exploit★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — calcom cal.diy
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