CVSS v3
10
CRITICAL
EPSS Score
0.9%
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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
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
Active exploitation of CVE-2025-71389 has not been confirmed. The EPSS score is 0.9%, indicating the estimated probability of exploitation in the next 30 days.
CVE-2025-71389 has a CVSS v3 base score of 10 (CRITICAL severity), with vector string 3.1.
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