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CVE-2025-71389
Critical · CVSS 10.0Published 2026-07-23
CVSS
10.0
EPSS
—
Exploited
No
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 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.
References
- 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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